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:jumping: :jumping: Looking to buy a 48 inch pc 4x65 or higher :jumping: :jumping:

This might be a stupid question but... I have 2 regular light fixtures and each hold 2x40w bulbs so that gives me 160 watts total, but if I add another one my total wattage would go up to 240w which would put me at a little over 3 watts per gallon because I have a 75 gallon tank. will 240w be...