Question On Lighting

[goin_all_out]

ok here is the thing, i wanted to upgrade my lighting from 1.5 wpg to 2. the "stand" i have is basically like in the picture, its an old sterio stand the i just took the shelves out of. the light i use are only 15" which is 14w each.now what i was going to step up to is a fixture taht has two 24" bulbs in it at 20W each giving me the "ideal" 2wpg. but as in the picture the distence between the top of the tank and where the lights would potentially sit is 8" from the top of the tank. this leave me room to open the top with an inch or two to spare, and enough space to put an internal filter (using fluval 104 currently but want more filtering). now i do have an all glass top, so the light can completely get in. am i looking at issues having the light that far up from the actual tank?

stand setup is here