Jabel,I am in transition right now,using the 8.5 x 18 inch HS with XPGs white and XPE RB,hope by end of year,I will be done. Definitely a general coral grower and grows sps well and my fixture will be 48 bulb,may use more RB next time to get the blue hue similar to 14k to 20k. I will post some pics of my fixture,on my first one,we used all XPEs,50/50 ratio but added 11 xpgs in the middle for a high noon blast. So there will be three heatsinks for my 225,a friend is helping me out.