Compact Fluorescent Lamps

Compact fluorescent lamps (CFLs) are fluorescent lamps with a bent-tube construction designed to fit in small spaces. CFLs can be of integrated or non-integrated design with non-reflector or reflector shapes. Whereas the ballast used to operate an integrated CFL is integral to the lamp, the ballast used to operate a non-integrated CFL is separate from the lamp and can be replaced. Non-integrated CFLs are constructed with multiple tubes joined together and are typically used in commercial downlights and wall sconces. Integrated CFLs are primarily spiral shapes (i.e. curly forms) with some including a bulb-shaped covering over the spiral. A good portion of integrated CFLs are medium base CFLs (MBCFLs) commonly found in residential fixtures.

The Department of Energy’s (DOE) has regulated the energy efficiency level of MBCFLs since 2005.