I have 2x250w mh right now on a 6ft tank. So the middle is darker and has been a problem. I decided to get a kessil 350w for middle. So I can have best of both worlds and see if theres a difference. I was going to go all LEDs until I saw multipul SPS tanks with colors consistantly more dull than mine. After seeing numerous people on here say it, and looking at local tanks LPS thrives under LEDs, and SPS will color out more under MH/t5, personal oppinion.