How do compact fluorescent lights compare with incandescent bulbs in energy use and lifetime?

Compact fluorescent lights (CFLs) are significantly more efficient and durable than traditional incandescent bulbs.

Regarding energy use, CFLs consume substantially less electricity—often 70% to 75% less—than incandescent bulbs. For example, a 60-watt incandescent bulb can be effectively replaced by a 14-watt CFL. Because they do not rely on the continuous heating of a metallic filament to produce light, they operate much cooler and waste less energy as heat.123

In terms of lifetime, CFLs are much more durable than their incandescent counterparts. While specific estimates vary, CFLs generally last about eight times longer than standard incandescent bulbs.3

Although CFLs have a higher initial purchase price due to the inclusion of an internal ballast, they remain more cost-effective for consumers over time because of their reduced energy consumption and extended lifespan. It is worth noting, however, that both CFLs and incandescent bulbs are increasingly being surpassed in efficiency and longevity by light-emitting diode (LED) technology, which lasts even longer and uses less power.132