I've installed CFL's where the light is on for longer than a few minutes per day. The rest are incandescents which are being replaced by halogens. The latter looks like a normal bulb, but has a smaler halogen bulb inside, and uses about 20%-30% less energy (42W instead of 60W24W instead of 40W, etc.). They are good for places where the light is often switched on and off for short periods of time, like in the bathroom or the hallway.
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