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  2. Orders of magnitude (illuminance) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    Starlight overcast moonless night sky [1] 140 microlux: Venus at brightest [1] 200 microlux: Starlight clear moonless night sky excluding airglow [1] 10 −3: 1 millilux: 2 millilux: Starlight clear moonless night sky including airglow [1] 10 −2: 1 centilux: 1 centilux: Quarter Moon 101: 1 decilux: 2.5 decilux: Full Moon on a clear night ...

  3. Guide number - Wikipedia

    en.wikipedia.org/wiki/Guide_number

    The No. 11 had a peak luminous flux of 1.8 million lumens. ... 8.58 m 10.30 m 10.87 m 1 / 250 th ... it is the product the brightness of light measured at the ...

  4. Candlepower - Wikipedia

    en.wikipedia.org/wiki/Candlepower

    The term candlepower was originally defined in the United Kingdom, by the Metropolitan Gas Act 1860, as the light produced by a pure spermaceti candle that weighs 1 ⁄ 6 pound (76 grams) and burns at a rate of 120 grains per hour (7.8 grams per hour).

  5. Maglite - Wikipedia

    en.wikipedia.org/wiki/Maglite

    2012: Mini Maglite AA Pro 215 Lumens and Mini Maglite AA Pro+ 245 Lumens. 2012: Maglite 2D pro 274 Lumens with a Cree XP-G rather than a Cree XP-E, increasing brightness while decreasing beam distance efficiency. 2012: Maglite Mag-Tac flashlight plain bezel, 310 Lumens, low mode at around 100 Lumens. First Maglite flashlight to use CR123A ...

  6. Luminous intensity - Wikipedia

    en.wikipedia.org/wiki/Luminous_intensity

    If a lamp has a 1 lumen bulb and the optics of the lamp are set up to focus the light evenly into a 1 steradian beam, then the beam would have a luminous intensity of 1 candela. If the optics were changed to concentrate the beam into 1/2 steradian then the source would have a luminous intensity of 2 candela.

  7. Luminance - Wikipedia

    en.wikipedia.org/wiki/Luminance

    A tea light-type candle, imaged with a luminance camera; false colors indicate luminance levels per the bar on the right (cd/m 2). Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. [1]

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