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Metal Halide Lights

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?