Mempho, you hit the nail squarely on the head that time.You just cant beat t-5 for bulb choices and combo's.A reefer can customize the look of his tank and maximize his growth rate.With bulbs from 3000k(not recomended) to 17000k.As it is with coral,retailers like to play the name games.Actinic,actinic+,super actinic+,and full spectrum.I have seen bulbs of 10000k all the way to 14000k described as "full spectrum".At 14000k the bulbs are blue enough to be what is called "stand alone",they need no actinic supplimentation.They are almost totaly blue and yet they get called full spectrum.5745k,thats the color temp of sunlight on the equator at noon and that is full spectrum.I have to say that 14000k and 17000k bulbs really make a tank look great.However the closer you get to total blue the worse the coral growth becomes.Many studies concerning coral growth say that 6500K is the best for coral growth,but it alone will make just about the ugliest tank you ever saw.I would recomend using a 50/50 mix of 12000k and actinic.