Lighting a 30 inch deep tank with a 2 foot center brace???

[intarsiabox]

MH fixtures have glass over the bulbs to start with as it absorbs some of the UV rays to make it safer. The bigger concern is to keep the brace clean as any dust, salt, etc will reduce the light to the corals. Some people run MH with full glass tops with good results but heat has to be dealt with accordingly.