How to drive a 10W RGB LED with 12v PWM?
I'd like to drive a 10W RGB LED, much like these ones found in the RGB LED floodlights. I want to strip all of the internal circuitry and control it with 12V PWM signals such as the ones that come from these controllers. They all seem to provide around 4A/channel.
My understanding is that each colour (Red, Green and Blue) needs around ~300ma, so I could use resistors, but as this is a fairly high power situation, there will be a large amount of power loss, and low efficiency. Is there another way ie with constant current drivers specifically for RGB chips that accept 12v RGB PWM input?