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  2. Surgical lighting - Wikipedia

    en.wikipedia.org/wiki/Surgical_lighting

    The distance between the center and this point is defined as L1. The similarly measured distance in the direction away from the light is L2. The depth of illumination without needing to refocus is the sum of the two distances L1 and L2. In the second edition of the IEC standard, published in 2009, the threshold value was revised from 20% to 60% ...

  3. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    Like the European modular furniture, display cabinets, ceiling tile grids, etc. they were designed for, these are based on multiples of the 300 mm (11.8 in) "metric foot" instead of the 12 in (305 mm) imperial foot, but are all 37 mm (1.5 in) shorter to allow space for the lampholder connections within the 300 mm modular units, and for much ...

  4. Light fixture - Wikipedia

    en.wikipedia.org/wiki/Light_fixture

    Ceiling Dome – the light source(s) are hidden behind a translucent dome typically made of glass, with some combination of frosting and surface texturing to diffuse the light. These can be flush-mount fixtures mounted into the ceiling, or semi-flush fixtures separated by a small distance (usually about 3–12").

  5. Optical path length - Wikipedia

    en.wikipedia.org/wiki/Optical_path_length

    The optical path difference between the paths taken by two identical waves can then be used to find the phase change. Finally, using the phase change, the interference between the two waves can be calculated. Fermat's principle states that the path light takes between two points is the path that has the minimum optical path length.

  6. Architectural light shelf - Wikipedia

    en.wikipedia.org/wiki/Architectural_light_shelf

    The fact that light shelves extend a fair distance into a room may result in interference with sprinkler systems. In Canada, they cannot exceed 1200 mm (4 ft.) in width if sprinklers are present or the design will require integration with sprinkler system to cover the floor area under the light shelf.

  7. Fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_lamp

    Compared with an incandescent lamp, a fluorescent tube is a more diffuse and physically larger light source. In suitably designed lamps, light can be more evenly distributed without point source of glare such as seen from an undiffused incandescent filament; the lamp is large compared to the typical distance between lamp and illuminated surfaces.

  8. Falling between two stools are the market towns and busy contemporary cathedral … ‘Between the Lights’ Review: Low-Key Romantic Drama with Spiritual Dimension Shows Another Side of England ...

  9. Sconce (light fixture) - Wikipedia

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

    The light of the candle flame was often intensified by a reflecting backplate. Using brackets, the candle or gas flame would be kept at safe distance from the wall and ceiling. [3] Modern electric light fixture sconces are often used in hallways or corridors to provide both lighting and a point of interest in a long passage. Sconce height in a ...

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