The most efficient decomposing bacteria thrive in temperatures between 110F and 160F. Thus, the hotter the pile, the faster the composting. If you achieve a good balance of carbon and nitrogen, provide lots of surface area within a large volume of material, and maintain adequate moisture and aeration, the temperature will rise over several days.
Exterior lighting is one of the best places to use CFLs (compact fluorescent lamps) because of their long life. If you live in a cold climate, be sure to buy a lamp with a cold-weather ballast