PC color combinations

Ive heard somewhere that the 50/50 bulbs do loose a little of there power, you would be better off with one 10,000K, one 420K, and one 50/50 in my opinion.
 
Lights higher up on the blue range of colour temperature tend to have lower PAR (photosynthetically active radiation) all else being equal.

Switch over to 10,000K bulbs for max. PAR, but the tank will look more yellow. Try two 10K bulbs with one pure actinic in front. Alternatively, try one 10K with two 50/50s
 
AquariaCentral.com