Ive been playing around with the circuit design and using single color LEDs ive managed to fit 27 more of them on the board! Im not quite sure how i did it either :S I think this way might work better. I can use brighter LEDs now and instead of 2 blues i can use 1 blue and use the 4th chanel for white. The price of the light has about doubled by using more LEDs but it should be worth it. Is 35,000mcd bright? It sounds like quite a high number.

Can i just double check that a 4V LED will be fine running on 12V if i use PWM? The average would end up being 3V. Im sure it was someone from here who said that would work but i dont remember who.

The alternative is to wire the LEDs in series-parallel and not use PWM when they should be at full brightness. The only problem i see here is that the light would use 4 times a smuch current because all 4 sets of LEDs would be on at the same time