If you have the space to run deeper sand bed in the fuge (and fine sand, ie. sugar) then by all means add it in there. Of course you've only got so much space for sand, live rock, and chaeto growth area so you'll have to balance the three. DSB will help to reduce nitrates in the DT and provide a breeding ground for critters. If you can, seed the sand bed with live sand from a mature system as it's important to have the population of worms, snails, pods etc. working their way through the sand bed to agitate it and keep it healthy.
As for the light, I'll +1 for the HD clip on 8" reflector lamp for like $10 and a compact flourescent screw in bulb around 6500k which work great for fuge lighting.
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