The problem I am seeing in parallel led designs is the wattage of the resistor.
I have managed to get down to a 5w resistor driving the Led's at 400ma at 6 volts per channel with 3.3v Led's 4 per channel.
I have managed to get down to a 5w resistor driving the Led's at 400ma at 6 volts per channel with 3.3v Led's 4 per channel.