I made one recently with 007 that is fantastic. I used Golden Naked Oats (crystal oat malt) instead of flaked oats and I believe this helped keep the beer from drying out too much. Alternatively, you could raise the mash temp. I like 007 a lot.
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If you are really set up to screw in a light bulb as a heat source for your box, you could substitute an Infrared emmiter used for keeping pet snakes and turtles warm. e.g. http://www.thatpetplace.com/pet/group/2533/product.web.