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The standard lamp and shade that sits on a table is general lighting, while the desk lamp is considered task lighting. Magnifier lamps are also task lighting. Animated fountain in Moscow's Square of Europe, lit at night. The illuminated ceiling was once popular in the 1960s and 1970s but fell out of favor after the 1980s. This uses diffuser ...
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Infrared lamps are also used for some night vision devices where visible light would be objectionable. Infrared lamp sources are used in certain scientific and industrial instrument for chemical analysis of liquids and gases; for example, the pollutant sulfur dioxide in air can be measured using its infrared absorption characteristics.
A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
Compared to a theoretical 100%-efficient lamp (680 lm/W), CFL lamps have lighting efficiency ranges of 7–10%, [39] versus 1.5–2.5% [40] for incandescents. [ 41 ] Because of their higher efficacy, CFLs use between one-seventh and one-third of the power of equivalent incandescent lamps. [ 38 ]
For a supply voltage V near the rated voltage of the lamp: Light output is approximately proportional to V 3.4; Power consumption is approximately proportional to V 1.6; Lifetime is approximately proportional to V −16; Color temperature is approximately proportional to V 0.42 [115]