My 750 is 8feet long and 5 feet wide, I am only using 2x175w single end in Lumenmax Elite reflectors with 2 6 foot VHO flourescents for supplementation (all about 16" above the surface), I have not checked par but there is no shaded spots and the tank looks pretty well evenly lit, granted it is a FOWLR but there is one anenome in there that is doing well, If I ever switched it to a reef I think I would add a third reflector and bump it to 400w, it all depends on bulb choice and reflector type IMO, I am running 3 400w SE on the 300 reef and the 750 still looks brighter visually, again I do not have a par meter to compare the important numbers.
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