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The light levels will roughly follow the "inverse square law". That law of physics says that the light intensity of a point source will decrease with the inverse of the square of the distance. What that means is that if you double the distance the light level will decrease to 1/4.
It isn't quite as bad as that for our lighting since the reflectors disperse the light so it isn't a point source. This means that the levels we measure won't fall off as quickly with distance. This also means though that it is impossible to predict how much it will decrease with distance.
Without knowing the design of your hood I can't really tell you how you could lower the lights. I would say though that even 2 to 3 inches can make a significant difference in the higher areas of the aquarium. The bottom of the tank will be affected much less by small changes in distance.
Allen
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"Never underestimate the power of the Schwartz." Mel Brooks
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