No bad effects so far, polyp extension is better and the zoas seem to be responding the best. I dont keep much sps in my frag sysem, so I cant comment on much. I have a german blue polyp monti and an ora pearlberry frag and they seem to be doing fine no brown out, or eroding flesh. As I stated before the shimmer is so natural looking, I havent seen many other leds in action yet other than pics. I would think onereefs leds are nice as well, he doesn't skimp on aquaria products. Cant wait to see what kind of growth I get. I have a light bar with motor I might rig up over the tank not sure yet.