Ok, I need some help from the lighting gurus. I am doubting my current choices. I was planning on running 3 -250w xm 20k bulbs. I thought with the tank only being 16" deep I could get away with less par. I recently just found out the ballast I have are hqi
(m-80). A more fitting bulb will be the radium 20k. It will have more par then the xm. The problem I see is I am pretty much stuck with this bulb, unless I go to DE and change reflectors and sockets. This I don't want to do. My other option is change ballast. The thing I am thinking now is get 400w magnetic ballast and run xm-20k bulbs. The only problem I see here are the chances of me needing a chiller are greater, and I don't really want to do this. I guess what I need to hear is that 3-250w radium 20k (with 4 110w vho) will be more then enough lighting to grow sps in a tank that is only 16" tall. I think it is, but now I am doubting. Please give me your opions.