I have been running LED for about 2 years. It will grow SPS as long as the are at the mid-point of higher, but I have a deep tank. I have one piece of SPS on the very bottom @ about 24" it has grown very little but has grown. (Bill has seen this piece, yes it very small). I have some other pieces left, a cap and a ton of pocilliopora. I am getting ready to change over to three part and will be adding back in SPS.