To much light?

[glstine]

I just got a new light it is a T5/MH with 346 Watts for a 30 gallon reef. Live stock is an oscellaris clown, lawnmower blenny, condy, flowerpot, candy cane and zoas. is that too much light? If so, can I replace the 250 W MH bulb with a 150 W. Had to go back to my quad T5 until I can figure out what to do about heat, was thinking maybe hang it a bit above the tank.

Thanks in advance.