BUT actinic doesnt have par levels that a 10k does........More par more light, more light more happy corals. :) I would personally.....(if I was staying with pc bulbs) do one 10k and one actnic. But thats me. The seperate bulbs are a LOT brighter than a 50/50 bulb. and you get better colorations.

Well..........a 50/50 is half 10k half actinic. its running two different gasses through one electrical current. so if you can focus the energy on one gas, your going to get more par. thats why I was thiking instead of two 50/50's you could run one 10k and one actinic. Same exact thing, just a little more light as far as par goes. should be the same money too.