Compact fluorescent lamp
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A compact fluorescent lamp, also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fi
The tubular-form CFL is one of the most popular types in Europe.
CFLs of varying power: 105W, 36W and 11W
Philips SL*18, an early CFL
A helical integrated CFL, one of the most popular designs in North America since 1995, when a Chinese firm marketed the first successful design
Incandescent light bulb
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An incandescent light bulb, also known as an incandescent lamp or incandescent light globe, is an electric light that produces illumination by Joule heating a filament until it glows. The filament is
Compact fluorescent lamp
…lamp (CFL), also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs. The lamps use a tube that is curved or folded to fit into the space of an incandescent…
Original carbon-filament bulb from Thomas Edison's shop in Menlo Park
Alexander Lodygin on 1951 Soviet postal stamp
Carbon filament lamps, showing darkening of bulb
Sir Joseph Wilson Swan