7500 lumens of what? CFL?
Do you have that light close enough to the plant?
Is it one plant?
In that size box 7500 lumen would be barely ok, minimal really, but if you can spend a few dollars I'd look on craigslist for a used 250w hps which is around 26,000 lumens. (If you really do have good ventilation that is)
What lights exactly and how many and where are they placed and how about a pic of the whole box with lights?
If you don't make the best use out of the 7500lumens with it positioned right and with white painted inside of the box or mylar you won't do well at all.
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