I find that on my primary system that the Halides far out perform the Led and I don't have to worry about dialing in spectrum (which by the way is something that I really just don't care for). I think that those of us who use Halides are becoming a very small percentage of reefers. People often talk about energy consumption and I noticed that for the limited time that i tried the LED and T-5 combo that I used more 50 watts less than i do with 4 400watt 20k Radiums. My clams that are on the sand bed love the halides and i think that all together my entire system is better both health wise and growth wise with the Halides.