Looking for some clarity on 1w led power Answered
I am having a hard time working the math and figuring out exactly what I need so I thought a question to others might help.
I am trying to determine the best way to power a led light. Here is what I am trying to accomplish.
I have 12"x12" box that will hold 4 round circuit boards. Each board has positions for 9 1w leds. 3 for red, 3 for green, and 3 for blue. Each color is in series. My goal is to use a 12v power supply for each box. So we are talking about trying to power 36 1w leds all together but they may or may not be all on at the same time. The box will be dmx controlled by a computer so that I can adjust the 3 leds in each color on each board. So its possible that I might only have 1 color on 1 board on for example. Or I could have one color on all 4 boards on (12 leds) at any given time. Or they could all be on.
My led specs
Red (610-630nm):DC Forward Voltage:2.2V~2.6V Forward Current: 350mA
green (510-530nm):DC Forward Voltage:3.2V~3.6V Forward Current: 350mA
blue (460-465nm):DC Forward Voltage:3.2V~3.6V Forward Current: 350mA
So a couple things that I am having trouble with. I know that I can power this with 12v using a high amp (15) source but then I need different resistors with high wattage ratings for different colors I would think? That seems like a lot of power wasted. So then I can go with a constant current driver but I can't seem to find one that would apower that many leds at once. Do I need to do two constant current drivers? Is there a better way? and what about the fact that each color on each board may be on or off at various times? Basically using the dmx controller to colorwash the different corners of the 12 x 12 box. Will that affect the power drawn and change the supply that I need?