Color Temps ?

Ive been all over these forums looking for a awnser but keep coming up empty so here mys 2nd post!

I have tons of T5 bulbs that are unused and left over from a saltwater reef aquarium that I used to keep. The bulbs are all 10k and 15k bulbs I know they put out enough light to grow stoney corals but can they grow stoney buds? I also have a few 20k bulbs but im pretty sure there useless as they burn a bright crisp blue color for the night time effect on a reef..

Any help would be great!
 
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