look at the blue leds from reefledligting. i have there led kit and when the blues are on my corals pop like nothing i have never seen before. love them.
I was doing the exact same thing looking for supplemental led to make my tank pop because i didn't want to get rid of my ati t5 fixture, and the new XHO reefbrites seemed like the best candidate for the job. but then i started to think for the price of that strip plus all the price to replace all of my bulbs, i could buy a Evo led fixture, and then i could sell my fixture and buy another Evo led fixture! I don't know, i haven't bought or sold anything yet but the more i looked into it the more appealing it was to me.