As some of you know I have a 40" tall tank, and I am not happy with growth and coloration of acros in the lower part of the tank. I was going to keep LPS in the lower part and SPS in the upper part but have now decided that SPS top to bottom is what I want 
I now have 4 x 400w MH and have been thinking about, rather than adding more bulbs, replacing two of the existing 400w bulbs with 1000w bulbs.
Any 1000w users here? (Bob?) Is this the way to go? Any drawbacks vs adding more 400 watt bulbs?

I now have 4 x 400w MH and have been thinking about, rather than adding more bulbs, replacing two of the existing 400w bulbs with 1000w bulbs.
Any 1000w users here? (Bob?) Is this the way to go? Any drawbacks vs adding more 400 watt bulbs?
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