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  2. 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] A sconce may be a traditional torch, cresset, candle ...

  3. Lumen method - Wikipedia

    en.wikipedia.org/wiki/Lumen_method

    Lumen method. In lighting design, the lumen method, (also called zonal cavity method), is a simplified method to calculate the light level in a room. The method is a series of calculations that uses horizontal illuminance criteria to establish a uniform luminaire layout in a space. In its simplest form, the lumen method is merely the total ...

  4. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    Surface roughness, often shortened to roughness, is a component of surface finish (surface texture). It is quantified by the deviations in the direction of the normal vector of a real surface from its ideal form. If these deviations are large, the surface is rough; if they are small, the surface is smooth. In surface metrology, roughness is ...

  5. St. George Reef Light - Wikipedia

    en.wikipedia.org/wiki/St._George_Reef_Light

    Architect's plans for St. George Reef Lighthouse. The light was first illuminated on October 20, 1892. It stands 144 feet (44 m) above the waterline. [5] The first complete survey of the rock was done in 1882, and construction began in 1883, with the blasting of the reef rock into a stepped pyramid to form the core that anchored the caisson to the rock.

  6. Trouble light - Wikipedia

    en.wikipedia.org/wiki/Trouble_light

    A trouble light, also known as a rough service light, drop light, or inspection lamp, is a special lamp used to illuminate obscure places and able to handle moderate abuse. The light bulb is housed in a protective cage and a handle that are molded to form a single unit. It has a long power line for distant reaching; the handle may also have an ...

  7. Precision approach path indicator - Wikipedia

    en.wikipedia.org/wiki/Precision_Approach_Path...

    The aircraft is slightly below the glideslope. A precision approach path indicator (PAPI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach. It is generally located on the left-hand side of the runway approximately 300 meters beyond the landing threshold of ...

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