Help for making a homelight with 12 LED

coucoujojo · May 12, 2006

Hello, i want to make a light with 12 LUXEON III led, but i don't know what power i must use, and what resistor i need (i don't want to burn the 12 led :grin2:

), your help is welcome!

(I don't want to use battery)

thanks

Builder · May 12, 2006

The simplest way is a 16volt DC source able to handle 2.5 to 3amps with a 3.3ohm 5watt resistor for each leg. THis assumes the supply is regulated - otherwise you may have to use a 5-ohm resistor so you don't ruin the LIII's.

coucoujojo · May 14, 2006

Thanks

16 volts? it's not 12V?

coucoujojo · May 14, 2006

this is a picture of my design projet:

Builder · May 14, 2006

coucoujojo said:
Thanks

16 volts? it's not 12V?

High Bin "H" or low "J" LIII's are 3.27v; multiply by 4 gives you a minimum requirement of 13 volts for 750mA. Of course there are any number of combinations for different voltages and arrangements.

In my opinion, one of the easiest way is to get bin "J" (or "K" with a little less brightness but more insurance) and run them, in parallel, off a regulated 3.3v supply like this one here... - good for 20 or so LIII's. 3.3v is very close to a perfect match and there are lots of good surplus computer power supplies available in that voltage.

Help for making a homelight with 12 LED

coucoujojo

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