10k 0r 12k pc lights

can some one tell me the drifference between the 65w,55w 12k and the 65w.55w- 10k power compact bulbs. which one should i use for my 55gal aquarium.
 
given my limited SW knowledge right now, I would let someone else chime in before trusting my answer...

but, my understanding of the different K's is that it is just color preference. The 12K will be slightly more blue than the 10K. If it looks too blue, then you will want to compensate it with another bulb being less blue (<12K and not actinic).

What I am not sure on is if there is something beneficial about 12K over 10K for corals.
 
IMHO - beneficially and asthetically if you dont have actinics then 12k would be better.

10K is the color that simulates the lowest dept for the deep water corals, and 20k simulates the color at the very deepest.
 
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