The setup would be two series pairs in parallel. Not a great solution for cool colors (green, blue, cyan and white) I'm afraid :(. Red, amber, yellow, orange and purple work well. Without getting too technical, it is because the forward voltage of the blue, green, cyan and white exceeds the 7.4V set up so you will be under powering the LED. Add that to the fact that the current available from PC is right at 1.5A (vs. the 2A available on CFV5), which will give you right at the minimum current of 750 ma per die, there is no ability for the current to help compensate for the under powering. Honestly, for a blue, green, cyan (Lux V only) or white you'd be better off with either a 5W LEDEngin, a Lux V, or a P4.