Performs perfectly! 12K Kelvin. very bright! i actually went 50/50 with these and removed them due to the white being overpowering on my other lamps. dont run very hot. very crisp white color for the 12K range.
Liked about it
very bright. pierces very well in a 30" tank. as always with WavePoints you can go to there website at Wave-point.com and see there spectrum chart to find exactly what you are wanting/needing. very good bulbs. very inexpensive.
Didn't like
slightly overpowering amongst other types... which is that really that bad? lol