into which mercury would be dispersed in the event of a breakage indoors. Environmental concerns about mercury contamination from CFLs have been raised, but they can be shown to emit less mercury into the environment overall compared to traditional incandescent bulbs, due to the significant reductions in power plant emissions. Compact fluorescent lamps start poorly when cold, and most types cannot be dimmed. A few specialty applications are unsuitable for CFLs.

Light emitting diode (LED) lamps are used