What would the heat build up be? Depends upon wattage? 15 W, 25 W?
How much light is necessary to deter the female wax moth from laying eggs?
I read the same article. I think he mentioned a 25W but any wattage would work as long the light reached to the bottom of the stack of supers. I guess that's why he stacks them 90 degs. to each other.. I always put my supers with frames in a chest freezer 24 hrs. before I think I'll use them just to make sure any moths and\or larva are dead.
Note: There's a good article in there on using mite resistance bees also ( Russians ).