Not to drag this off topic, but there's a safety concern with light bulbs.
As others have mentioned, a light bulb produces quite a bit of heat. When I was really sick one time as a kid, Mom wanted a night light in my room so she could come in and see if I was still breathing during the night. The light bothered me, so she covered it with a scarf. She smelled smoke the next time she came in to check on me! This was one of those Christmas light-sized bulbs, which was most likely a 7 watt lamp.
When we built our house, I placed receptacles under the windows on a single switch for a candle circuit. We only buy 4 watt lamps for these. At 4 watts, they are plety bright, and stay fairly cool......................chim