I have owned a Fluval Spec before. You can use a desk lamp, but just make sure it's either raised very high above the tank or water-resistant as the minute splashes from the water can knock out the lights easily. I also noticed that if the light is too close it evaporates the water like crazy, which left unsightly hard water marks along the top of my tank.
Just out of curiosity, what are you keeping in it?
How much wood could a woodchuck chuck if a woodchuck could chuck wood?
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