I was going to go into a lengthly review of these lights on my thread.
I would have to agree with the OP. It is in fact the lights. I have the 36-48 inch foxture over my 40b, I specifically got the extra long one so that i would have coverage from side to side with no fading. It is a great light as far as mushrooms and leather, zooas too. My duncan likes it as well. I will post a video in a few hours hopefully on my thread showing placement with comments about their performance or lack thereof. lol
You really cant beat the niftiness of the light, it is awesome and gives of a really colorful shine, I get shimmer too and the features are there too. BUT it will only do well over a shallow tank with LPS
and particular ones at that. A 75g is waaaay too tall for these lights to penetrate. My LFS
uses a dual unit of them though and grows SPS
under em, BUT his coral tanks a re like 8 inches tall. lol
SOmeone remind me to post on my thread all the details if I forget. I have been so uber busy I havent had a chance to post.