Compact fluorescent lamp

A compact fluorescent 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 bulb, and a compact electronic ballast in the base of the lamp.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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The science of light, made practical — photometry in plain English, plus the lumen, lux, candela, and energy calculators every lighting decision needs.

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