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2. Fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Fluorescent_lamp

   A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.

3. Compact fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Compact_fluorescent_lamp

   Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]

4. Fluorescent-lamp formats - Wikipedia

   en.wikipedia.org/wiki/Fluorescent-lamp_formats

   Cross section of a typical fluorescent lamp with and without a reflector. Some lamps have an internal opaque reflector. Coverage of the reflector ranges from 120° to 310° of the lamp's circumference. Reflector lamps are used when light is only desired to be emitted in a single direction, or when an application requires the maximum amount of ...

5. United States lighting energy policy - Wikipedia

   en.wikipedia.org/wiki/United_States_lighting...

   Automatic shutoff control must be met for lighting alterations, including lamp and ballast retrofits when 10+% of connected lighting load is replaced; Automatic shutoff is no longer limited to buildings greater than 5,000sq.ft. Occupancy sensors are now required; Parking garage lighting controls are now required; Hotel/motel lighting control ...

6. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   The typical response of human vision to light under daytime or bright conditions, as standardized by the CIE in 1924. The horizontal axis is wavelength in nanometers. [8] Luminous efficacy of radiation measures the fraction of electromagnetic power which is useful for lighting. It is obtained by dividing the luminous flux by the radiant flux. [4]

7. Sconce (light fixture) - Wikipedia

   en.wikipedia.org/wiki/Sconce_(light_fixture)

   A sconce or wall light is a decorative light fixture that is mounted to a wall. [1] The sconce is a very old form of fixture, historically used with candles and oil lamps . They can provide general room lighting, and are common in hallways and corridors, but they may be mostly decorative. [ 1 ]