Benny, few quesitons...
1.How has your coral responded to the LED's?
2.How blue is your setup? Would you consider it 14 or 20k?
I'm just beginning to research the LED side of things and plan to keep mostly acans. I don't know how they'll fair under LED's.
Well I don't know if I'm qualified to answer either question (or if my answer will provide much value), but I'll try my best based on my limited experience with LEDs.
1. So far I've had a Sarcophytum, Rhodactis, birdsnest, trumpet, and green Montipora cap., under the LEDs. All of them have shown growth but the coloration has not been the best (except for the Rhodactis which glows a bright green). From what I've seen and read, I'm confident you can keep most corals alive and growing under LEDs, as long as everything else is in check (water quality, flow, etc). But I have yet to see deep, vibrant colors like I've seen under MH, T5s, or even PCs. I think this may be due to the limited spectrum given off by the two colors of LEDs in the PAR30 bulbs. There are an
increasing number of people out there messing around with different colors of bulbs, trying to find the right combination for growth and coloration.
2. Color temperature seems to be a pretty subjective measurement, especially depending on the light source, but I'd say it's closer to 14K than 20K. It does have a slight blue tinge, but not overly so. There is definitely some fluorescing going on in the Rhodactis, but not as much as you'd see under pure actinics.
I actually have two frags of acans lined up that I will be adding within the next week. I'm hoping to see some good colors from them once they acclimate; for the most part the acans I've seen look better under bluer light.
FWIW, all of the pictures in this thread were taken in RAW format and then processed to match the color temperature as closely as possible. I would say it is pretty close, but probably a little more blue in real life. Hope this helps.