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Proper lighting for a 120gallon?? Anyone have an opinion? :)

I am in the process of trying to determine what sort of lighting to put over 
my 120gal.   My plan is for an 'almost optimum aquarium' -- e.g.  no heating 
cables, but will have co2 and plenty of lights.   It seems easy to find info 
on Co2 requirements, etc.  but lighting appears to be less straight forward.  
So... my question is what is the suggested lighting for this size tank.  
Dimensions are 4'L x 2'W x 2'H.  I am assuming metal halides (x2) with remote 
magnetic ballast and spider reflectors  but what wattage is unclear.  Money 
is not the issue with the halides (all wattages are of similar cost).   Would 
like to hear opinions from those with similar setups who have had good 

Will Kimbro