I'm toying with the idea of putting metal halides over my 90 gallon tank. I'd use an enclosed hood but I can't decide how many bulbs to use. If I center one 175 watt bulb, I'm afraid the tank's center plastic brace will either cause a shadow or melt. But a 175 on each end seems to be way too much light. I don't want to use hanging fittings because of the stray light issue. Any ideas?