Lighting Kit Question

I have built a custom hood for a planted 40g and I want to install some of
the AH Supply kits, but I'm uncertain which would be the best for my tank.
The tank is 36" x 18", so should I use the 2x55W kit which is 24" x 8"
(actually 2 of 24" X 8") or the 96W lit which is 35" x 4"? The question for
anyone that has one of these kits, is how much spill is there off the ends?
If I use the shorter 55w kits I can easily cover the whole tank front to
back, but will have about 5" on each end uncovered. I think if I get the
96W it would be too narrow, but it would cover the whole length of the
tank. Does it matter one way or the other? Any suggestions are greatly
appreciated.
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Ben
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