What Do I Need to Know to Design an LED Lamp

First, 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're 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's the point of wiring half of them each way? Why not use a bridge rectifier?

So I had an idea for an LED lamp. I've got some old flashlights that have older model CREE LEDs.

My idea is that I'd put the LEDs in parallel, alternating polarity so that for each phase of AC, half of the LEDs will be conducting.

The array of LEDs would be in series with a resistor and a fuse to drop voltage from 110 VRMS from the outlet to 3VRMS over the LEDs and prevent the LEDs from breaking if something catastrophic happens (and to compensate for my own failings.)

The LEDs have a 5V reverse voltage and a 3.3V forward voltage at 3A at 80 deg C, so I figure if I limit to 3 VRMS I should't hit the reverse voltage and make badness happen.

With this in mind ... I am only passingly familiar with anything more advanced than kirchov's and ohm's laws. I can't apply ohm's law to the diodes, so what do I need to know to figure out the resistor value for n parallel diode pairs (Or maybe n sets of 5 in series and put those in parallel)? or is it just a bad idea?

·OTHER ANSWER:

So I had an idea for an LED lamp. I've got some old flashlights that have older model CREE LEDs.

My idea is that I'd put the LEDs in parallel, alternating polarity so that for each phase of AC, half of the LEDs will be conducting.

The array of LEDs would be in series with a resistor and a fuse to drop voltage from 110 VRMS from the outlet to 3VRMS over the LEDs and prevent the LEDs from breaking if something catastrophic happens (and to compensate for my own failings.)

The LEDs have a 5V reverse voltage and a 3.3V forward voltage at 3A at 80 deg C, so I figure if I limit to 3 VRMS I should't hit the reverse voltage and make badness happen.

With this in mind ... I am only passingly familiar with anything more advanced than kirchov's and ohm's laws. I can't apply ohm's law to the diodes, so what do I need to know to figure out the resistor value for n parallel diode pairs (Or maybe n sets of 5 in series and put those in parallel)? or is it just a bad idea?

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Question About a 19 LED Lamp Bulbs?
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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.
Can You Grow Weed Under a Normal LED Lamp?
No, not enough intensity and not the correct color temperature1. Why can light from a laser burn things, and from an LED or lamp cannot?You need a better lens. Seriously, which is to say that the LED is dumping its output power into a large solid angle, so re-collecting it all is rather difficult. Also, are you certain you are quoting the mean output power of both devices? If that's their peak power, the LED's mean power could be far less if (as with many LEDs) it's pulsed to reduce the internal heat load2. Can I use a 110V LED lamp on a 220V socket?I would say NO!!!It will probably fail immediately, possibly with fire and smoke. It may work, but fail later, when you've left the room, with fire and smoke.It is also not guaranteed to be insulated properly for 220V and you could get a shock. I actually think this is a very very rare probability, but you really do not want to take the risk. It may be marked with a safety mark, which has no meaning if you abuse the device by giving it double the voltage, four times the power3. Why does my Betta fish puff out it's gills when I turn on an LED lamp?Betta fish (male) sing his own praises their gills because it truly is their way of creating themselves look larger at the same time as the strive against with others.. Your fish would imagine the mild is an outsider and thanks to get rid of it. Or the mild would prepare his mirrored image extra and he would imagine it truly is yet another intruding on his territory! desire this helped!.4. 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 take5. Will excessively high temperature bring damages to the LED lamp?not at all. in led lamp mostof are made up with led bulbs which are emit there temperature by the heat plate in its backside.in led lamps that heat plate is attached to a heat sink plate on led lamp. so temperature of led bulbs are spread over heat sink plate. anyway if temperature is too high,it may cause only to led bulb to blown.only small probability to damage occur to whole led lamp6. Dim LED lamp with constant current power supply using resistorsPWM may cause current measurement errors and long wires can introduce inductive voltage/current errors. I suggest you use a TO-220 transistor so it does not get hot, and bias the base current with a Voltage control Rseries or a pot and series R to limit the base drive, in order to dim the LEDs . A voltage divider to 0.4V will turn off the transistor then bias to 1V with 1mA should shunt the collector and turn off the LEDs by choosing the right R ratios and values from Vdc. This is using it as an active shunt load like your resistor except with short path control between source, control and load in a small loop area to minimize wire inductance. It is the rise time that can cause issues not the PWM rate which might be >>1000x higher bandwidth if running at 2kHz for e.g. If we had some idea of the circuit, I could be more exact.
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