Compact Fluorescent Lamps

Compact Flourescent Lights can reduce energy consumption by up to 75%
Compact fluorescent lamps (CFLs) combine the energy efficiency of fluorescent lighting with the convenience and popularity of incandescent fixtures. CFLs can be installed in regular incandescent fixtures, and they consume less than one-third as much electricity as incandescent lamps. They are most cost effective and efficient in areas where lights are on for long periods of time.
CFLs can replace incandescent bulbs that are roughly 3–4 times their wattage, saving up to 75% of the initial lighting energy. Although CFLs cost 3–10 times more than comparable incandescent bulbs, they last 6–15 times as long (6,000–15,000 hours).
CFLs are designed to operate within a specific temperature range. Most are for indoor use, but there are models available for outdoor use. You can find a CFL’s temperature range on most lamp packages. You should install outdoor CFLs in enclosed fixtures to minimize the adverse effects of colder temperatures.