The next best thing you could do would be to vent that light, when they are vented properly you can put em right down on the plants, and when you can get em down like that...........the yield improves substantially, and I would say the quality too........I got some nice buds under the 600. I know a lot of folks runnin the 400 with excellent results.
I still need to watch the electrical usage, I can't have the landlord asking questions