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It depends on a couple things. What size is your tank, and what type of coral would you like to, or plan to keep?
if you want strictly LPS go T-5's if you want mainly SPS go MH
A 120 would be the perfect tank for an 8 bulb Tek light, or 6 overdriven T5's in a retro canopy.
Overdriven means putting more power to the bulbs then they are designed for. When you connect a 54 watt T5 bulb to an Icecap 660 ballast it will drive the bulb at 80 watts. This will give more light, with a reduction in bulb life.
Kim

