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# im trying to hook up 200 LEDs in groups of 3-4 that can individually be turned off, whats the best way to power this? Answered

so im new to calculating power needed for projects so im hoping for some help

im trying to hook up 200 LEDs in groups of 3-4 that can individually be turned off, whats the best way to power this?
should i run the 3-4 leds in parallel ?
and i need to be able to turn clusters of lights off.

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We would require the forward voltage of the LED and how much current you want to let pass through it. This is my favorite LED Resistor Calculator

The 3-4 lights should be wired in series (three would be best) And drive them with 12v through a transistor. I hate to quote the Led Strips again, but they use the same Idea.

If you look around on that site there's plenty of other tools. Plz note, the parallel resistor calculator they have isn't something that could help you with this project

I would still urge you to look at the neo-Pixels; you can cut them into individual LEDs if you need. I only repeat my self because they will be Far easier to wire and control then individual LED's.

Reply with the Led's Forward VoltageAnd I can help walk you though the calculations. Usually it's a 47-Ohm for 3 LED's in series @12v, But I can't say for sure without some data.

unfortunately i cant use the string lights for this, but what kind of power source should i use to power all this and what kind of resistors should i use for the sets of 3 and 4?

thanks guys

I Second Steve. If you wanted to save time, try some 12v Led strips. They are already in groups of three and will run at between 9-13.5v. Just cut the strips along the copper traces. Should find a local supplier no problem.

If you want to do something fancy, try Neo-Pixels. Not the most economical solution and has high current requirements. It is a 5 Volt system, (20ma * RGB) = 60ma each, x 200 Leds = 12A at full power, 4A if you just use one colour at a time.

On the upside, Each LED is Addressable,(Code them as is, or in groups of 3 or 4), Minimal soldering needed Vs individually soldering 25 some-odd groups and you only need a single Digital output to control up to 200-ish lights! (depending on your controller) Hope you share what your making :D

Run the LEDs in SERIES only. If you can program, I'd use an Arduino and a real serial LED driver chip for each 8 group of 4 leds.