400w or 250w - Metal halide

[I have an 6-foot 180g tank with 2-400w metal halide and
2-160w vho. I was wondering if I should change my 2-400w metal halides to 3-250w? or just keep what is setup now?thanks Woody]
 
[Does it have a center brace? If so I would leave it alone. If not I would move the two apart some so another 400 would be in the center. But thats just me, I love paying electric bills. On my 215 I have 3-400 watters and 2-250 watters and 500 of vho actinics. :very sad:]
 
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