Is This a Bike Light and How Do I Turn It on? (I Know It Sounds Stupid)

A brief Google search of "Soulbitez halogen lights" returns hits where almost all the lights are Dynamo powered. My idea is that, like the light you mentioned as having previously, this one in the photo may have to be connected by a missing wire connected to a Dynamo. I do believe it is a light, as why the word, "halogen" included on the piece? It is useful as a reflector, but rather large to use only that function.

Look for a way to access the bulb and a place where a wire may have led from the light to the Dynamo. Accessing the interior will surely result in observations that will reveal whether the light has an area for batteries and would be then not likely to be Dynamo powered. I'd begin this exploration by focusing on the thinner area on top where it appears there's an opening where a screw or the like might be. Just forward of that, there's a section of the seam that is a little wider where a thin coin or flat screwdriver fits to pry the sections apart. Do look for a screw or other fastener within that hole to the rear of that seam which might prevent the sections from being pried apart

• Related Questions

HD Projectors 1920x1080 native Resolution 120 inch screen

I finally bought 2 of to be exact, I bought one. And then realize that the second one is better for me. So I exchange the first one with the second one.

Acer H6510BD projectorcentral.

com/Acer-H6510BD.

htm is the way to go.

However, my room has a width of 3.

2 m and I want a REALLY BIG screen.

So I search for something similar but smaller throw radius.So I exchange that withBenQ W1080ST expensive. But I think I will be able to get a big 4 m wide TV I have always wanted to work peacefully.

Regular TV would have cost $5k and stuff. This projector only costs $1200.

Yes, the second one is more expensive. So it depends on where you want to put things. If you want to put it on a big room where you can afford some distance between the projector and the TV, then the first one is the way to go.Note: I should have answered with something I recommend rather than actually bought. However, I finally bought.

.. can be interpreted as I recommend .

... I mean why would I buy something I don't think is good? Not sure how the mod would think

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How to modify a Minecraft ore lamp to be always on?

Blue LEDs usually require a bit more than 3 V to drive enough current through them to operate brightly. Your lamp has a switching chip to boost the voltage from the nominal 3 V supplied by the battery. The inductor coil L1 (black cylinder, upper right) is one of the giveaways for this. The 8-pin chip is possibly a small micro. It's feeding each of the LED black wires individually and is monitoring the vibration switch (sticking out on the left). If it's a micro we won't be able to re-program it.

simulate this circuit Schematic created using CircuitLabThe simplified schematic above is what I can make out from the photo. (Anyone can edit if they can add more.) V1 represents the output of the voltage booster. The chip turns on each LED by connecting it's resistor to negative supply.

I suspect that you could desolder each LED black wire and solder a resistor from each LED black wire to GND (bottom right) and it would work.Homework: when you get access to the multimeter measure the voltage between GND and one of the LED red wires. Test it at each brightness setting and record the results. Report back and we'll update this answer. Wait for a few comments on this suggestion before you proceed with soldering

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Does H1 LED Bulb Fit in to existing H1 HID Bulb Projector?

Yes, they are manufactured to regular specifications. It'll be even better.I replace all bulbs in our cars to led the moment we get the car. These days majority of the bulbs in cars are LED, but still I end up changing a few since it's not all 100% led all round.

Get proper projected leds and put them in a good projected lens with a little adjusting it'll kill the competition. HID is just a waste of energy, too bright like the sun, but very difficult to guide it in a long beam. If what you say was true, are all the engineered leds a waste? Acura and Aston Martin are going all led with Hella MAtrix system. Mercedes and Audi have been doing this since 2012.Personally on our SUVs I've got 3000K with projectors in head lamps, and fog lamps with 4000K. In our sedans good bright 6000K in all possible locations. And I've swapped out brake lights, blinkers, parking lights, safety lights, interior lights, dashboard, instrument cluster, HVAC, glove compartment with all 6000K bright and some even projected bulbs. It's all 100% white. Only the SUV lights at 3000K look yellow but bright and powerful6000K is amazing in dry weather. 4200K is amazing all round. 3000K is solid for penetration power in horrible weather conditions.

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Individual Led vs LED Strip

if I were you I would make something like this:Here's a link if you want to play aroundI reread your question and saw that you said the LED strips needed 12V. That it was not your battery that delivered that. Your battery delivered 4.2V - 3.2V.In that case this schematic would be much more viable:Here's a link if you want to play aroundLet's compare how bad it is to use current limiting resistors instead of using a buck converter or boost converter. Assume that a X converter is 80% efficient. Let's also assume that you will use 4 LED's like in the schematic above.$P VI$

$P_LED 4(3.30.02) 264 mW$ the 4 comes from 4 LED'sWith a boost converter you'd get this equation:

$P_w/converterfracP_LED0.8 frac0.2640.8 330 mW$With 50 ohm resistor per lane like in the schematic it would become like this:

$P_w/resistor I^2R P_LED 4(0.02^250)0.264 344mW$$frac344330104%$ So if you use a constant current boost converter that is 80% efficient instead of 50 ohm resistors, then you'll be 4% more efficient. It will be the same story if you use more LED's, the 4% that is. But if you however get a constant current boost converter that is more efficient than 80%.. then that one will turn the 4% to like 20% and then it might be more viable.

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What components go into making a dimmer switch for an LED lamp?

LED normally are dimmed via PWM puls width modulation. If you use the reduction of the DC voltage you will change the color temperature. Dimming is normally performed in the LED power supply. His requires a constant mains voltage input and it will be controlled via an IR remoter control which acts on the secondary side of the "electronic transformer and changes the PWM to just and only change the brightness.But in several households there are wall mounted dimmers fixed besides the door from the ages of the Edison light bulb times - which ended just recently.. These can still be used. They work on the modification of the sinus but this is slow process and can lead to added flicker which is not pleasant. But there are "electronic LED Transformers" which can convert the Phase width modulation into a higher frequent PWM with the required constant voltage amplitude which in turn is required to drive the LED with a constant current of 350mA. So it makes from a variable input voltage a phase modulation proportional PWM with constant output voltage to reach a constant current through the LED.This kind of "electronic transformer is a bit hard to find but it is the optimal solution in this caseWhat components go into making a dimmer switch for an LED lamp?.

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TRIAC Dimming Modules - 60Hz Module on 50Hz Supply

I have now worked on several products that incorporated triac controls. Cost was the driving force when selecting their features and functions. The cheaper product's microcontroller simply did not have enough memory to support dynamically selecting 50/60. Therefore the software was hard coded and two market specific software versions were made. The more expensive product needed a micro with more inputs and outputs. This gave the micro the side effective of having more memory. The greater memory gave the ability to code dynamic 50/60 support. Triac's have a minimum on pulse value to ensure that they turn on. The software that I have dealt with slides that pulse around to change the dimming. The problem can come from how often that pulse is synchronized with the zero crossing. If it's every half cycle then the wave form is symetric and there won't be any problems until very low dimming is needed. In the scenario the pulse will slide over top of the trailing zero crossing false triggering the triac for another half cycle. This would cause flickering but only when a very low dimming state is reached. If the synchronization happens every cycle then the waveform won't be symmetric between the first half cycle and second half cycle. This will cause flickering as soon as dimming is induced.

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Could nail polish damage pure PLA?

Nail polish will not damage your PLA model.1) Let's talk about "gel" nail polish. Gel polish self-levels, does not drip, is cheap, is much more health-friendly than many finishing methods, and only takes 30 seconds under a suitable strength UV/LED lamp to dry, providing a thick smooth coat (clear, color, glitter!, anything) that makes any layer lines disappear. 2) The FDA regulates nail polish in its "cosmetics" category, so, not only are the ingredients known, they have to be printed on the bottle.

3) Gel polish consists of various methacrylate monomers which undergo a radical (in the chemistry sense, although it is pretty darn cool too) polymerization process that is UV-activable. Filament is primarily polyactide, which is polymerized at room temperature. Polymerized polyactide reacts with methylacrylate at the ends of the long strands (not in the middle, which is what you would describe as "damage"). Methylacrylate actually makes the PLA ends less reactive (read: it makes it stronger). As an industrial material, this compound is known as "supertoughened" PLA.Hope that clears things up a bit. As an aside, if you're not familiar with the different families of nail polishes, and you want to try this, you can tell if the polish you're looking at is "gel" because the bottle will be opaque (keeps UV out).

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Is the life of an LED lamp related to the number of times it is switched on/off?

I'm going to say there are two things that wear out equipment in an accelerated manner.One is extended use at high temperature. The high temperature accelerates all problems caused by entropy. The chemicals break down, oxidize, corrode and elements migrate. The higher the temperature the faster these things happen and the shorter the life becomes. This is a well known factor.The other factor that shortens life of equipment is mechanical wear. Vibration cycles and mechanical shock events cause wear after some point where the materials flex and ultimately crack and break solder joints, PC traces, wires, filaments etc. In the same vein, repeated thermal cycles can cause mechanical wear by thermal expansion and contraction cycles.I'm going to say a well designed product keeps these mechanical events in a range where its is completely elastic and doesn't cause undue stress and is not a factor. Sometimes its unavoidable - like filaments need to be so thin and therefore can succumb to mechanical/thermal shock eventually. But it can happen so products can have a lifetime limit due to on-off cycles. But I would in general say its probably a poorer product if its so limited.So in answer, it shouldn't be, but it could be. Is the life of an LED lamp related to the number of times it is switched on/off?

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The ATtinyX313(A) (ATtiny2313, ATtiny2313A, ATtiny4313) can be configured as a SPI, I2C, or UART slave or as a USB device with some work, and has 4 Output Compare pins available for PWM control. Simply write slave code that allows the RPi to send commands to it to change the brightness of attached LEDs via low-side NMOSFET drivers• Related QuestionsWhy do LED lights with a dimmer stay dim and won't go bright again?Unfortunately, Some Guy is right in that your dimmer and LED lamps are squabbling over some electrons; apparently your lamps are the losers in this case, though.The cure, though, is the same -- replace the dimmer with one that's designed for dimming LED replacement lamps (Lutron has a dedicated line for CFL and LED-retrofit loads, at least -- check around)------Does an equivalent LED bulb for an inner bulb of an old incandescent E14 bulb exist? closedWhat you have shown is an M11 bulb. 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The packaging can even influence the rating if it can't keep the parts cool.------Light Dimmer Causes Internet DropAn alternative to changing the light dimmer would be to re-wire the telephone line between the phone and the network interface device (or as far as you could re-wire it) with Cat 6, while making sure the wire is at least a foot away from any power wires. This creates better immunity to alien noise. Could use Cat 6A, it is shielded as well.------How much power is wasted with a light dimmer?The potentiometer's function now is to change the "trigger" point of a triac.The trigger points on the AC sine waveThe AC Sine wave with the missing part up to the trigger point.Many LED light bulbs have triac dimming.LED DRIVER WITH TRIAC DIMMABLE CIRCUIT.Which looks like this located in the base of the light bulb.------How can I split a ground wireI've seen this before in rentals I own, lights with no boxes, I wouldn't do it but that must be the local building code. 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Bare/exposed conductors is an exceedingly dangerous condition that cannot wait.------LED lights with a dim light in open circuitAs mentioned above, the cause is phantom (ghost) voltage most likely caused by using a twin active cable from the light to the switch. This can be fixed by either by replacing the cable with two sdi (single double insulated) cables or burning ghost voltage by adding a small load such as an iron core transformer in parallel with the light fitting------How much power is used by cabin lighting systems during flight?According to this link, an Airbus A-321 has around 100 LED units for cabin lighting which have 45 individual diodes each. Do you have 4500 diodes in the cabin in a single aisle plane, which means at 0.05W per LED estimation, the cabin lighting would require 225 W of power.p.s. 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Not all LED bulbs are equally efficient. There simply isn't any direct conversion. You need to check the specs for the specific bulbs you are comparing------curious affect of led lampsI sometimes have the same effect in some of the LEDs in my own home.I assume you are using a dimmer? What brand and model?I am using Lightolier electronic dimmers, with LED level indicators on the side. The tiny load the dimmer causes will create current flow through the LED lamps in the fixture. A backlit device can do the same thing.------What should I consider when choosing continuous lighting vs. strobes for studio photography?Overall light output vs rate of energy usage / heat output.There's a reason hot lights are called "hot"; they put out a lot of heat per unit of light, especially compared to strobes. And heat doesn't do anyone any good. That's why strobes are more often preferred for still photography, and hot lights are more often used for video (where strobes aren't an option).------I need help fixing a chest freezerNo the led is not your problem!An led will only show if there is voltage. Try putting a load on that outlet a volt meter may show good but plug in a curling iron and nothing. This happens with backstabbed receptacles all the time , sometimes a loose screw or wirenut . Try a load test and you may find the power goes way.------Technique to measure/infer Vf for LED given IfAssuming an LED or string of LEDs with no current limiting built in:The simplest way is to connect a constant current supply which is set to 700mA and can provide at least 14V, preferably more. Note, that's a constant current not a current limited supply.Then measure the voltage across the LED. That will be the forward voltage------Using US lamps in Europe closedThere are several different kinds of circuits used for LED lamps. There are also different kinds of "adapters". Many combinations of lamps and adapters are NOT compatible. You must do more careful and detailed analysis of how each different lamp is constructed and what kind of converter or adapter is suitable.Your question is over-simplified and cannot be properly answered as a generic generalization------How can this lighting/color effect be done?I don't see how it can be done in camera unless you set up a bunch of monochromatic objects in a studio. Sure it can be done but may be more difficult than handling it in post. To me this is likely one of two things: a very well done composite image or selective black and white in the background.------Network issue with Ubuntu 14.04.3 in Hyper V environment / not running stableAfter I had reinstalled 14.04.2 on the pysical PC and just made apt-get upgrade (not dist-upgrade), everything works fine (the login screen shows 14.04.3, but the kernel is still 3.16.0.30).I made the same steps on the VM and there it works fine, too.So I think the problem is part of the kernel (3.19) which is installed from the 14.04.3 installation ISO file.------How does a CPU calculate on a hardware level? closedThat's a good question, something I'm curious in learning more about myself. From what I can tell so far:I think these links might help explain more in case I didn't answer your question the way you wanted. htm.
Can I Take Any Blue LED Lamp and Grow?or Are There Some LEDs Special for Growing?
yahoo search is a good tool for that question1. Voltage, Current, LED lamp question...?Where did the 50 amps figure come from? (You are not confusing it with 50Hz, are you?) To drive a current I down a LED with forward voltage V, a rule of thumb is to start with a voltage 4 times V, and connect the LED on series with a resistor 3*V/I. Yes, just a rule of thumb. The forward voltage quoted is only a typical value, and will vary from one LED to the next. Using a higher supply voltage and a series resistor keeps the current more or less constant despite variations in the forward voltage.2. How to find current and voltage requirements of an LED lamp / strip using a multimeter?Attach the LED lamp to a power supply and ramp up the voltage until it is acceptable bright. Record the voltage and current. That is your new rating.You can not tell the actual rating with knowing the ratings of the parts inside and how they are connected. The packaging can even influence the rating if it can not keep the parts cool.3. how can I make a regulator of some sort to protect my led lamp from burning out?There are ways to convert 12 volts DC to 6 volts DC, but the right thing to do for this sort of project is either to get a light that is natively 12 volts, or a battery that is natively 6 volts. Google "12 volt LED light" and you will see many4. LED lamp - connecting LEDs in parallelThere are plenty of LED lamps that do not have current limiting resistors and rely on the LEDs being equal. This often is not a problem or not seen as a problem.The LEDs might be "equal enough" for the current to divide itself properly. Maybe the current is not exactly divided equally but as long as the difference in the current through the LEDs is not too small or too large, the difference in currents is not a problem.The LEDs themselves have some series resistance.With many LEDs in series, differences in forward voltage will "average out" reducing the difference between LED strings.Is putting a series current limiting resistor for every string and using CV source a more robust solution and why not do it in this way?Indeed this would be a more robust solution to add current limiting resistors.The reasons why this is not always done might be cost (a resistor cost money and might take up valuable space where there could be an LED). Also: it works without resistors so why add them?5. Does LED lamp gives protection to our environment?No. Even a perfect lamp that produced only light does not "protect" the environment. All it does is damage it less than any other type of light does. It still uses power, which means you need a power plant, which produces pollution and greenhouse gases. .6. LED and lamp in series - why does the bulb not light?The LED drops so much voltage that there is very little left for the light bulb.You have only two 1.5V batteries, which, in series, are barely enough for the LED forward voltage.Incandescent bulbs quickly go dim when the power which they dissipate is reduced: power is voltage squared, divided by resistance. For this very reason, dimming incandescent bulbs does not save much energy. Only a small fractional decrease in the dissipated wattage dims a light bulb almost all the way.Filaments generate mostly heat, and only a small fraction as visible light. This is very sensitive to temperature, which is very sensitive to dissipated power.Try looking at the lamp in a dark room; you may be able to see a faint red glow. Also, the light from the LED may be preventing you from seeing whatever dim glow the bulb is putting out, even in a dark room. Cover the LED, too.7. how to install a led lamp inside mouth?A miniature LED, if connected with a tiny 1.5 volt button cell,properly, u can keep it well into ur mouth.but with uneasiness8. LED lamp increased power consumption after installation: Why? [closed]With the limited information provided, this is a guess, and a suggestion for clarification, but... Where did you get consumption of 2W per lightbulb from? Those are simple LED's, no special drivers or current limiters included in the package. If you have them in a series string, you need to limit the MAXIMUM forward current for the entire string to 150mA (from the datasheet as absolute max If). You can not do this just with a voltage source, and for a series string, I would not attempt it with a single resistor either, use a current regulator.If you have them in parallel, you can use a series resistor with each individual LED, based on your supplied voltage, to limit its current.The wild guess/speculation part is here... I am thinking that without proper current control to the LED's, you are burning them out, and they are failing as short circuits causing more current to flow as the voltage drop across failed ones vanishe.
How Can I Project a Clear Light Shape on the Wall with an LED Lamp?
Focusing the light requires some tinkering. The size of the hole is a factor. The distance between the light source and the apeture is another factor. Also, if you are using multiple LEDs then there will be multiple stars per hole; each LED will make a star. Some words to google might be diffraction, interferance, and apeture. Also you could perhaps pick up some info from making an eclipse viewer1. Can I take any blue LED lamp and grow?or are there some LEDs special for growing?yahoo search is a good tool for that question2. Can you convert a halogen lamp to a multiple LED lamp and still get comparable luminous flux?Your biggest problem will be heat dissipation. High power LEDs dump a lot of heat down their cathode leads. If you do not keep the LED's cool enough they will degrade and die early. So you need to design for heat sinks & air flow; which brings up the next problem. Halogen bulbs are designed to run hot, so the fixture probably was not designed with air flow/heat disapation in mind. So figure on modifiing the fixture for improved air flow.3. can we get lesser power consumption if we use LED lamp?LEDs are small, very efficient solid bulbs. New LED bulbs are grouped in clusters with diffuser lenses which have broadened the applications for LED use in the home. I like INNORI Eye-protected Touch Sensitive Dimmable LED Desk Lamp,3-Level Brightness for Different Occasions. LED technology is advancing rapidly, with many new bulb styles available. Initially more expensive than CFLs, LEDs bring more value since they last longer. Also, the price of LED bulbs is going down each year as the manufacturing technology continues to improve.4. Can kitchen salt break a LED lamp circuits/board? (weird problem) [closed]Specs: YN600 Air adopts double mains input,which supports batteries of NP-F Series external DC main of 8V and 5A. YN600 Air adopts YONGNUO proprietary LED constant current driving technology There is also a 12V 5A supply.----You are seeing failures with the line voltage AC to DC converter not the 8V constant current.The salt must be completely removed with a good quality isopropyl alcohol with several rinses and then forced air dried for many hours to ensure no moisture under chips. The LEDs are still good and you can run from 12V.They use salt to boil water rapidly with just electrodes at line voltage and will fry the converter if used again and not carefully cleaned of all salt ions which will not be easy and may consume a bottle or two and require vacuuming.Salt is corrosive and it may be easy to destroy it. So look for YouTube videos and chalk this up to experience.5. can you use sally hansen gel polish without the LED lamp?no it is not possible the chemical in the polish is specifically made to cure with the led lamp. if you let the polish not cure and it just dries the chemical that makes the shine last might still be active and if you eat finger foods like chips and such you might ingest the same chemical because it was not cured with the led bulb6. Story problem: you leave the house for a weekend, accidentally leaving a 3W LED lamp on for about 36 hours. If you pay $0.11 per kWh for power, how much money have you wasted by leaving a light on for two days?3*36= 108 W or 0.108 kWh *.11= $0.01188Story problem: you leave the house for a weekend, accidentally leaving a 3W LED lamp on for about 36 hours. If you pay $0.11 per kWh for power, how much money have you wasted by leaving a light on for two days?7. Why does my Betta fish puff out it's gills when I turn on an LED lamp?Maybe the time is too long,u need to know something anout it8. Does LED lamp gives protection to our environment?Neither our environment nor financial growth ought to be put in front of another. we are no longer speaking approximately oil and water, interior the sense that they can not mixture. in reality, Sustainable growth has been utilized via industry for some years. The evidence is interior the pudding, that sustainable growth works! Lumber agencies now want to diminish sensibly, rather of clean slicing a close-by. chosen timber are decrease, mutually as others are left to enhance, new ones are planted as against the felled timber. this way, the lumber agencies will continuously have product to reap. This additionally minimizes, yet does not thoroughly get rid of erosion of soil, or habitat loss. inspite of the shown fact that, it is a lot extra advantageous than the alternative... clean slicing. in reality that people might desire to proportion this international, we are able to depart a footprint no remember what we do. inspite of the shown fact that, minimizing that footprint will depart the two us and our environment in an superior condition. To think of that economics ought to be positioned on the lower back burner is only naive. without financial growth, how can you grow to be knowledgeable? shuttle? How will people locate out approximately our international, and grow to be extra advantageous stewards of the earth, if we are all out of a job and ravenous?? it is a provide and take relationship that people have with our environment. we would desire to locate the stunning stability between provide and take
Suitable Wiring for Very Low Current Mains Equipment
Mains cabling doesn't just have to supply power to your lamps; it also has to be safe in the event of a fault. If your lamp short circuits, you don't want the cable to burn out or start a fire before the fuse blows (if you're in a fused plug country like the UK) or the breaker trips! So standard 3-core mains cable probably is appropriate. See also MandoMando's comment on the correct insulation. Or as Dave Tweed says, use low voltage lighting and a mains transformer (perhaps look for garden or outdoor lighting systems)EDIT: if the rest of the installation is up to "double insulation" standards with no exposed metalwork, then 2-core mains cable would be acceptable, saving some spaceI'm building an interactive portrait gallery with seventy portraits, each back-illuminated by an LED lamp. The lamps draw less than 30 mA at 230 Vac, and each is switched using a small optocoupler/phototriac, under microcontroller, er, control.Given the very low current draw of the lamps, standard 3-core mains cable seems to be considerable overkill. (All of the wiring will be hidden within the gallery structure, out of the way of prying fingers; we have a mains bus, from which I can tap the connections for each lamp.)Would a three-strand section of ribbon cable be up to the job? Some specs I've unearthed are rated to 300 Vrms (and up to 1 A), which would seem to be suitable. But what consideration would I have to give to voltage spikes?I want to build something safe, but a lighter cable would make construction much simpler.
Can I Use Regular Nail Polish with the Sensationail LED Lamp?
You can in a way but it will take a little longer. Start as you usually would with applying gel polish: Cleanse nails with the cleanser - air dry Apply Primer - air dry (30 seconds should do it) Apply base coat & cure for 30 seconds Then apply your normal nail polish Now is the long winded bit - you have to wait for your normal polish to completely dry (not just touch dry!) This will take 30-40 minutes Then you can apply the top coat, making sure you cap the edges, cure for 30 seconds Cleanse and you are done. I have a ton of normal polishes but what I usually do is apply Sensationail fully so it lasts the 2 weeks. When I want a change of colour I paint over the top in normal polish. When I get bored after a day or 2 I remove that coat with acetone free remover and the sensationail gel is still perfect underneath!1. Can you convert a halogen lamp to a multiple LED lamp and still get comparable luminous flux?Your biggest problem will be heat dissipation. High power LEDs dump a lot of heat down their cathode leads. If you do not keep the LED's cool enough they will degrade and die early. So you need to design for heat sinks & air flow; which brings up the next problem. Halogen bulbs are designed to run hot, so the fixture probably was not designed with air flow/heat disapation in mind. So figure on modifiing the fixture for improved air flow.2. Changing my fluorescent lamp to led lampUsing Ohms law. Since we know the current, source voltage, and LED forward voltage drop, we must calculate for the series Resistor. R = (V Source - V Forward) / I.(6V - 2V) / 0.02A = 4V / 0.02A = 200220 is the next resistor up.Now since we have the resistance, we can calculate Wattage of the Resistor. P = V (of Resistor) * I4v * 0.02A = 0.08W or less than 1/8th (0.125) Watts. A 1/8W Resistor would work.A better solution is two leds in series, sharing the current. (6 - 2 - 2) / 0. 02 = 1002v * 0. 02A = 0. 04W. A 100 1/8W would work.3. What exactly is a PAR type LED lamp, how does it differ from R/BR type LED & CFL lamps?It should be noted that while PAR LED's have the form factor of traditional halogen PAR bulbs, they do not have the parabolic reflectors of traditional PAR's. The light emitting diode cannot be suspended in space, in the middle of a reflector the way a filament can, at least not yet, it has to be mounted on a board. So, all of the light is coming directly from a group of LED's through a lens. This is why they have not found a way to produce a good narrow spot yet, because the way they did that was by adjusting the shape of the parabolic reflector. I have seen some progress in finally some focusing ability in LED flashlights, so maybe we will get some real PAR spots with a sharply defined pattern in the near future. They do not appear to be available now. I have put PAR LED's in my office and my kitchen, but in my media room where I have to have defined light and dark areas, like accented prints on the walls and no light hitting the TV, I am going not buy another round of halogen bulbs and hope the technology improves in LED's.4. can we get lesser power consumption if we use LED lamp?yes, and they last a lot longer too5. What exactly is a PAR type LED lamp, how does it differ from R/BR type LED & CFL lamps?PAR = Parabolic Aluminized Reflector. The number is the diameter of the bulb times 8, so divide by 8 to get its diameter. Thus, a PAR30 is a 3.75" diameter bulb.Our last house had PAR30 floods in track lighting in the living room (a style that was all the rage when the house was built in the 1980s). You can use them indoors. The quality of light you get is entirely dependent on the bulb. A beam angle of 40 degrees or more will render close to the typical light dispersal we all grew up with. There are some LED floods available, and a few offer a greater than 30 degree beam angle with a diffusing lens at around 3000k color temperature. If you can find some, they can save you a ton of money over the years.
Powering Stuff *Directly* From Solar Panels Feels Like Magic
Alright, I'll give you that a solar powered LED lamp with no energy storage is pointless. Still, witnessing light turned into electricity and then back into light is pretty in neato. There's something about the immediacy of catching sunshine and turning it directly into useful work that thrills me.The framerate of the camera on my phone makes this fan look like it's spinning slowly. Rest assured it was in fact running at full speed. It's a testament to the miraculous efficiency of electric motors that they can do so much with so little. The panel is advertised as 7 watt after all, but only reliably outputs about 1 watt.Plenty of power for this fly trap, which consumes only 40ma at 5 volts. The panel produces 280 ma at 5 volts, or 7 times as much as the trap requires. The set of USB appliances which consume sufficiently little energy to be powered this way isn't very diverse, but you'd be surprised what it includes.As it turns out, there's a few vehicular applications where direct solar power works fine. Boats are one example as they use little energy to move, relative to their mass. Their surface area is also often ample, so there's plenty of room for panels:Airships have many of the same qualities: They need a fairly small amount of energy to move through the air relative to their mass. This makes them suitable for direct solar power as well:There's also been a directly solar powered RC car, the Tamiya Solar Eagle. It does have a single capacitor to keep it going through shadows, or if a cloud crosses the sun, but besides that it runs directly off the panels:Why isn't this more common? Sunlight has a fixed energy density of 1 kilowatt per square meter of surface that it strikes. That's how much energy we could get from a 1 meter by 1 meter solar panel if it was 100% efficient. However the solar panels available to the public today max out at 22.5%, though the cheap ones can be as little as 15-17% efficient.So, that's 225 watts for every square meter of solar panel, best case scenario. That's about 25 watts short of being able to power the weakest electric bicycle motors available today. As you might imagine, powering a car this way is pretty difficult unless the car is extraordinarily lightweight and aerodynamic, as well as being totally covered in the most efficient solar cells on the market.Follow me for more like this! And why not read one of my stories?·RELATED QUESTIONWhich custom lighting design manufacturers would you choose to work with (as in, your preferred list of custom lighting design manufacturers for new projects, renovations, and/or construction of a new home and/or commercial property) and why?Residential and commercial lighting are different products. You do not give a reason for wanting custom vs. off the shelf products.A unique custom lighting product is backlit onyx and hinoki wood walls, desks, columns, and stairs by GPI Design of Cleveland. The onyx and hinoki veneer are sandwiched between glass.Boyd Lighting is a San Francisco Bay Area maker of high end lighting.Phoenix Day is another Bay Area custom manufacturer.Holly Hunt is a collection of custom lighting manufacturers.Working with a lighting designer will save you time and money while guaranteeing your project will meet codes, function, and look good.
Is This a Bike Light and How Do I Turn It on? (I Know It Sounds Stupid)
This is a halogen light. Such lights are usually powered by a bottle dynamo. That is a small electric generator that is driven by the front or the rear wheel. There is usually no switch. One simply engages the dynamo by pushing it down, such that a spring presses it against the flank of the tyre.Some bikes have a hub dynamo instead. In this case there might be a small switch at each light. A hub dynamo looks like a very large front hub (central part of the wheel).If you have such a dynamo make sure that the light is connected to it. Follow the wires from the lamp to the dynamo. On older bicycles with bottle dynamos there is typically only one wire. The bicycle frame serves as common ground connection.Check if the dynamo is properly pushed to the tyre and that its wheel spins when you spin the tyre.The bulb in the lamp might be defective or missing. Replacement bulbs are not very expensive. But they may be hard to find today. An inexpensive led lamp might be a better replacement, as such lamps are considerably brighter.Finding the fault may be a little tricky without a volt meter or other means to test electrical connections. If you cannot got to a bike shop anyone who is handy with simple electrics may help you out. For example, electricians or car mechanicsI've been doing a lot more cycling in the last year since moving to a new town and have really enjoyed it.I had a fairly crappy bike though and went to a secondhand store quite far away to get a good bike at a nice price.One big issues is there is what I assume is the bike light in front of it (just one) but I see no way to get it to actually turn on, which means I can barely cycle now.I used to have the lights where you move that part down to touch the wheel and the movement causes the light to go on (best way I can explain it). This doesn't do that. I also don't see any on/off button or basically any obvious way to get it to work. The store I bought is really far away as are the good bike stores (I live in a small town.)I've started to wonder if it's really a light or a reflector - although it looks like the former. Any help please?
Question About a 19 LED Lamp Bulbs?
Provided you buy the right one, they are omni-directional just like the cfl or incandescent before them1. Switch on off using triac BTA24, When off keep flashing LED lampI've experienced this on several LED bulbs, usually the cheaper ones, but not always. There is some leakage though the triac. IGBTs tend to "close the gate tighter" and not flicker those cheap bulbs. Sometimes having more cheap bulbs on the circuit helps, but the qty varies widely in my unscientific experimentation. If you are stuck with what you have, place a small dummy load on the circuit with the LED bulb. Old AC/DC adapters (heavy, non-switching) work well without heat, noise, or light (you do not even need to plug in the DC part). I use that method the most. Regular tungsten light bulbs are good as well; nite-lights included (as tony mentions). Or you could build some fancy circuit; i am sure the experts around here have some suggestions2. What's the problem in designing a bright enough LED lamp?The problem here is one of scale.The way an LED works is that the electrons jump from the N side to the P side of the semiconductor junction, and as they do so some of the electrons fall into 'holes' in the P side. This changes their energy level, and causes the discharge of a photon - ie, light.This means that:Yes, you can have multiple LEDs in a 'bulb' to give a larger amount of light, and to provide a more diffuse shadow pattern, but still as the light diffuses it gets very much dimmer. It then becomes a problem of sheer bulk - trying to get enough LEDs into a small enough area to give enough light at a reasonable distance.That is why they work OK in a table lamp at close range, but at longer range (the ceiling) they are next to useless3. What kind of inductive load does a mains LED lamp present?LEDs are a nonlinear load and probably these lamps will not have a power factor correction converter. This means that the current will not be sinusoidal therefore you will have some reactive power flowing. There may be a PFC choke before the rectifier bridge. If you want to measure the power factor and harmonic content just take a scope with voltage and current probes and measure line voltage and line current. PS. This it how you distinguish China Export mark from European CE:4. can you grow weed under a normal LED lamp?growing weed is illegal and a felony however i dont think an led will provide the energy for photosynthesis5. What do I need to know to design an LED lampFirst, using a resistor to drop from 120V to 3V is very, VERY inefficient. You will be burning off about 90% of your energy in heat. You need a transformer here, at the very least. Just doing the math: If you need 3A/3.3V for light, then 3A/120V is 360 Watts of power, of which you are extracting 9.9W for the actual diodes, and thus burn about 350W in heat in the resistors.Second, LEDs in parallel is unreliable, because the actual voltage drop of the LEDs will vary a little bit because of process variance, and thus some of the LEDs will draw a lot more current than others. This will result in the lower-voltage LEDs burning out, and the higher-voltage LEDs being dim. To fix this, you need one current limiting resistor per LED, rather than a single one for the gang.Finally, what is the point of wiring half of them each way? Why not use a bridge rectifier?6. Does a 5w LED lamp require 5w/per hour to run ?Watts (power) is joules (energy) per second (time). A 5W LED lamp running for one hour will therefore consume 5W * 3600s = 18kJ of energy. 1kWh is equal to 3.6MJ7. LED and lamp in series - why does the bulb not light?There MUST be a resistor in series with the LED. An LED is a diode, and diodes rapidly increase the current they pass as the applied voltage rises above a certain point, well below 3V. So without a current-limiting resistor, the LED would pass so much current it would burn out. The previous answers that say the LED drops the voltage are correct, but the drop is across the combination of the LED and the hidden resistor. The light bulb just adds a little more resistance, which reduces the current a little but only make the LED a tiny bit dimmer. But the light bulb is robbed of the minimum voltage it needs to light.
Powering Stuff *Directly* From Solar Panels Feels Like Magic
Alright, I'll give you that a solar powered LED lamp with no energy storage is pointless. Still, witnessing light turned into electricity and then back into light is pretty in neato. There's something about the immediacy of catching sunshine and turning it directly into useful work that thrills me.The framerate of the camera on my phone makes this fan look like it's spinning slowly. Rest assured it was in fact running at full speed. It's a testament to the miraculous efficiency of electric motors that they can do so much with so little. The panel is advertised as 7 watt after all, but only reliably outputs about 1 watt.Plenty of power for this fly trap, which consumes only 40ma at 5 volts. The panel produces 280 ma at 5 volts, or 7 times as much as the trap requires. The set of USB appliances which consume sufficiently little energy to be powered this way isn't very diverse, but you'd be surprised what it includes.As it turns out, there's a few vehicular applications where direct solar power works fine. Boats are one example as they use little energy to move, relative to their mass. Their surface area is also often ample, so there's plenty of room for panels:Airships have many of the same qualities: They need a fairly small amount of energy to move through the air relative to their mass. This makes them suitable for direct solar power as well:There's also been a directly solar powered RC car, the Tamiya Solar Eagle. It does have a single capacitor to keep it going through shadows, or if a cloud crosses the sun, but besides that it runs directly off the panels:Why isn't this more common? Sunlight has a fixed energy density of 1 kilowatt per square meter of surface that it strikes. That's how much energy we could get from a 1 meter by 1 meter solar panel if it was 100% efficient. However the solar panels available to the public today max out at 22.5%, though the cheap ones can be as little as 15-17% efficient.So, that's 225 watts for every square meter of solar panel, best case scenario. That's about 25 watts short of being able to power the weakest electric bicycle motors available today. As you might imagine, powering a car this way is pretty difficult unless the car is extraordinarily lightweight and aerodynamic, as well as being totally covered in the most efficient solar cells on the market.Follow me for more like this! And why not read one of my stories?·RELATED QUESTIONWhich custom lighting design manufacturers would you choose to work with (as in, your preferred list of custom lighting design manufacturers for new projects, renovations, and/or construction of a new home and/or commercial property) and why?Residential and commercial lighting are different products. You do not give a reason for wanting custom vs. off the shelf products.A unique custom lighting product is backlit onyx and hinoki wood walls, desks, columns, and stairs by GPI Design of Cleveland. The onyx and hinoki veneer are sandwiched between glass.Boyd Lighting is a San Francisco Bay Area maker of high end lighting.Phoenix Day is another Bay Area custom manufacturer.Holly Hunt is a collection of custom lighting manufacturers.Working with a lighting designer will save you time and money while guaranteeing your project will meet codes, function, and look good.
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