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  2. Recessed light - Wikipedia

    en.wikipedia.org/wiki/Recessed_light

    Different types of recessed lighting in a warehouse "Pot light" or "canister light" implies the hole is circular and the lighting fixture is cylindrical, like a pot or canister. There are three parts to a recessed lighting fixture: housing, trim and bulb. The trim is the visible portion of the light.

  3. Light fixture - Wikipedia

    en.wikipedia.org/wiki/Light_fixture

    A light fixture (US English), light fitting (UK English), or luminaire is an electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment. [1] All light fixtures have a fixture body and one or more lamps.

  4. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    R17d recessed double contact; One of the first diameters of fluorescent lamps, with the 15W T8 and 30W T8 having been introduced in 1938. [3] The European energy-saving krypton T8 lamps were introduced by Thorn EMI during the 1970s. [4] The North American energy-saving argon T8 lamps weren't introduced until the 1980s. [5] T9 T29 1 + 1 ⁄ 8: ...

  5. Cove lighting - Wikipedia

    en.wikipedia.org/wiki/Cove_lighting

    December 2009) (Learn how and when to remove this message) Cove lighting of the Sala Vicarial in the Monasterio del Escorial , San Lorenzo de El Escorial, Spain Cove lighting is a form of indirect lighting built into ledges, recesses, or valances in a ceiling or high on the walls of a room.

  6. Track lighting - Wikipedia

    en.wikipedia.org/wiki/Track_lighting

    Track lighting is a method of lighting where light fixtures are attached anywhere on a continuous track device which contains electrical conductors. [1] [2] This is in contrast to directly routing electrical wiring to individual light positions. Tracks can either be mounted to ceilings or walls, lengthwise down beams, or across rafters or joists.

  7. LED lamp - Wikipedia

    en.wikipedia.org/wiki/LED_lamp

    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 ...

  8. Halogen lamp - Wikipedia

    en.wikipedia.org/wiki/Halogen_lamp

    An R7S is a double ended, Recessed Single Contact (RSC) linear halogen lamp, usually measuring a length of either 118 mm or 78 mm. Some less common lengths are 189 mm, 254 mm and 331 mm. These lamps have a T3 shape on an RSC/R7S base. These can also be known as J type and T type lamps.

  9. Coefficient of utilization - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_utilization

    For example, some of the light emitted by a luminaire may exit away from the desired plane and is therefore wasted. A CU measures the light actually reaching the desired plane as a percentage of the total light produced by the fixture. The value for direct lighting varies from 0.2 to 0.5 while that of indirect lighting varies from 0.1 to 0.3