The frag tank t5s were looking pretty dim and the corals we turning brown. Not knowing the history on the bulbs I decide to get some knew ones, I picked up 2 actinic and 2 10k, the spectrums seemed to be the closest to the ati blue plus and ati coral plus. I was very wrong, the light is insanely white, not only is it white, it seems to be lot dimmer then the ancient ati bulbs. Even but an ati blue back in in have of one of the 10k bulbs, still not happy with it. Anyone have any experience with these bulbs?