Flourescent light bulbs small enough to fit into standard light sockets, which are much more energy-efficient than standard incandescent bulbs.

Small fluorescent bulbs which often can be used in a standard medium-base socket. CFL's use 20-40% less electricity than incandescent bulbs and are color adjusted to produce light close to real sunlight. Desk Lamps - Used on desks for work or study. Light source should be about 15" above work area.

A small fluorescent lamp that is often used as an alternative to incandescent lighting. The lamp life is about 10 times longer than incandescent lamps and is 3-4 times more efficacious. Also called PL, Twin-Tube, CFL, or BIAX lamps.