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2. 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 ...

3. Light fixture - Wikipedia

   en.wikipedia.org/wiki/Light_fixture

   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. Landscape lighting - Wikipedia

   en.wikipedia.org/wiki/Landscape_lighting

   Light fixtures - fixed location - line voltage (120 V U.S. or 240 V Europe) and low voltage (12 V U.S.) [2] Post mount - column mount; Address light; Wall mount; Ceiling mount - hanging fixture; Security lights; Tree lights - up and down lights; In-grade fixtures- uplights buried in-ground - top flush with surface; Adjustable aim "bullet" - uplight

5. Architectural lighting design - Wikipedia

   en.wikipedia.org/wiki/Architectural_lighting_design

   The protective housing is concealed behind a ceiling or wall, leaving only the fixture itself exposed. The ceiling-mounted version is often called a downlight [8] Sconce A decorative light fixture that is mounted to a wall [45] Street light A type of outdoor pole-mounted light used to light streets and roadways; similar to pole-mounted flood ...

6. History of AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/History_of_AC_power_plugs...

   The first US power plug and socket dated 1904. Several early American electrical plug and socket arrangements were invented by Harvey Hubbell. On 26 February 1903 he filed two patent applications featuring 2-pin plugs and adaptors for using his plugs with existing designs of lamp sockets and wall receptacles.

7. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy ...