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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. Foot-lambert - Wikipedia

    en.wikipedia.org/wiki/Foot-lambert

    A foot-lambert equals 1/π or 0.3183 candela per square foot, or 3.426 candela per square meter (the corresponding SI unit). The foot-lambert is named after Johann Heinrich Lambert (1728–1777), a Swiss-German mathematician, physicist and astronomer. It is rarely used by electrical and lighting engineers, who prefer the candela per square foot ...

  4. Luminance - Wikipedia

    en.wikipedia.org/wiki/Luminance

    A luminance meter is a device used in photometry that can measure the luminance in a particular direction and with a particular solid angle. The simplest devices measure the luminance in a single direction while imaging luminance meters measure luminance in a way similar to the way a digital camera records color images.

  5. This Genius Calculator Predicts How Many Lights Your ... - AOL

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  6. Light meter - Wikipedia

    en.wikipedia.org/wiki/Light_meter

    Use of a light meter for portrait cinematography in a Turkish music video set. A light meter (or illuminometer) is a device used to measure the amount of light.In photography, an exposure meter is a light meter coupled to either a digital or analog calculator which displays the correct shutter speed and f-number for optimum exposure, given a certain lighting situation and film speed.

  7. Candlepower - Wikipedia

    en.wikipedia.org/wiki/Candlepower

    Narrow-beamed lights of all sorts can have very high candlepower specifications, because candlepower measures the intensity of the light on a target, rather than the total amount of light it emits. A given lamp has a higher candlepower rating if its light is more tightly focused. [2] Candlepower is still used today in law.

  8. How Many Feet of Christmas Lights You Need for Every ... - AOL

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  9. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    light-day: ≡ 24 light-hours ≡ 2.590 206 837 12 × 10 13 m: light-hour: ≡ 60 light-minutes ≡ 1.079 252 8488 × 10 12 m: light-minute: ≡ 60 light-seconds ≡ 1.798 754 748 × 10 10 m: light-second: ≡ Distance light travels in one second in vacuum ≡ 299 792 458 m: light-year: ly ≡ Distance light travels in vacuum in 365.25 days [6 ...

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