T5HO don't require a chiller most of the time...MH
on the other hand is a totally different story. They heat entire rooms up!
But, in terms of the LEDs, they are highly effective. X is right that good growth of coral isn't all about the lighting, but when strong lighting is required it is hard to beat LEDs water penetration and coral growth when you tie it into how much money you save on bulbs and energy consumption. X is a big fan of the taotronics LEDs and has good results from them. I have great growth out of my Radions, but am addressing a 'dull' color out of some of my sps
. May or might be related to intensity, still addressing but feel it is noteworthy to mention it being easy to have lighting up too high and get dulled colors.