My inspiration of the lighting needs comes from looking at http://www.stevesleds.com
(good company btw). Steve designed his systems to support the growth of the stony corals that have very high light requirements. So I'm using his research as a base for my designs. The corals get the necessary light from the cool white bulbs. The blue are for making the flourcent colors pop. So in researching the warm white to cool white, i turned to see what our indoor gardners using. For t5ho, they recommend 3:1 cool to warm ratio. Since we are dealing with a bulb that is just blue LEDs with phosphorus added to create white, i wanted more warm red to counter balance. The warm white is 2700-3000k and cool white is 6500-7000k. Both are within the usable spectrum of the plants.
This weekend I'll start at creating a documented how to. I want to build another fixture to test on my 10g planted tank.
If I'm starting to peak interest, I got great news for you. I've established communication with the Chinese manufacturer in getting the LEDs directly.