I understand why you need lights that are 10K kelvin in strength, but what is an Actinic light and why do most powercompact lighting systems combine them with 10k's?
Actinic is the term used to describe fluorescent bulbs with phosphors that emit violet/blue wavelengths around 420nm. The reason why such a bulb exists is because studies have shown that 420nm is the most efficient wavelength for photosynthesis in Chlorophyll A (studies down with plants).
A good standard mix of fluorsecent bulbs is a daylight bulb (usually 10KK) mixed with equal part actinics. It's not necessary to have this mixture, but people's experiences have shown this to be an effective mix.
I use actinics to supplement my 10,000K metal halides. Actinics give great color pigmentation and rendation to my corals.
