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  2. Foot-candle - Wikipedia

    en.wikipedia.org/wiki/Foot-candle

    In the US lighting industry, foot-candles are a common unit of measurement used by architects to calculate adequate lighting levels. Foot-candles are also commonly used in the museum and gallery fields in the US, where lighting levels must be carefully controlled to conserve light-sensitive objects such as prints, photographs, and paintings, the colors of which fade when exposed to bright ...

  3. Daylight harvesting - Wikipedia

    en.wikipedia.org/wiki/Daylight_harvesting

    Daylight harvesting systems are typically designed to maintain a minimum recommended light level. [1] This light level will vary according to the needs and use of the space; for example, the commonly recommended light level for offices is 500 Lux (or around 50 foot-candles) on the desktop.

  4. Lighting ratio - Wikipedia

    en.wikipedia.org/wiki/Lighting_ratio

    Light can be measured in footcandles. A key light of 200 footcandles and fill light of 100 footcandles have a 3:1 ratio (a ratio of three to one) — (200 + 100):100. A key light of 800 footcandles and a fill light of 200 footcandles has a ratio of 5:1 according to the lighting ratio formula — (800 + 200):200 = 1000 / 200 = 5 : 1.

  5. Daylight factor - Wikipedia

    en.wikipedia.org/wiki/Daylight_factor

    This is a suite of tools for performing lighting simulation, which includes a renderer as well as many other tools for measuring simulated light levels. It uses ray tracing to perform all lighting calculations. One failing in many of these calculations is that they are often completed without wall hangings or furniture against the walls.

  6. Illuminance - Wikipedia

    en.wikipedia.org/wiki/Illuminance

    Illuminance diagram with units and terminology. In photometry, illuminance is the total luminous flux incident on a surface, per unit area. [1] It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. [2]

  7. Conservation and restoration of photographs - Wikipedia

    en.wikipedia.org/wiki/Conservation_and...

    Light levels should be kept at 50–100 Lux (5–10 footcandles) for most photographs when in use for research as well as exhibit. [23] Exposure of color slides to the light in the projector should be kept to a minimum, [22] and photographs should be stored in dark storage. [23] The best way to preserve a photograph is to display a facsimile. [7]

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    mail.aol.com

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  9. Foot-lambert - Wikipedia

    en.wikipedia.org/wiki/Foot-lambert

    A foot-lambert or footlambert (fL, sometimes fl or ft-L) is a unit of luminance in United States customary units and some other unit systems. A foot-lambert equals 1/π or 0.3183 candela per square foot, or 3.426 candela per square meter (the corresponding SI unit).