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  2. Orders of magnitude (illuminance) - Wikipedia

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

    Download QR code; Print/export ... which is a lumen per square metre. Factor Multiple Value ... Frosted incandescent light bulb [5] [6] [12] 10 6:

  3. Magic Lantern (firmware) - Wikipedia

    en.wikipedia.org/wiki/Magic_Lantern_(firmware)

    Magic Lantern is a firmware add-on for various Canon digital single-lens reflex (DSLR) cameras and the EOS M. [2] It adds features for DSLR filmmaking and still photography, and is free and open-source. Magic Lantern was originally written for the Canon EOS 5D Mark II [3] by Trammell Hudson in 2009 after he reverse engineered its firmware. [1]

  4. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    lux (= lumen per square metre) lx (= lm/m 2) L −2 ⋅J: Luminous flux incident on a surface Luminous exitance, luminous emittance M v: lumen per square metre lm/m 2: L −2 ⋅J: Luminous flux emitted from a surface Luminous exposure: H v: lux second: lx⋅s L −2 ⋅T⋅J: Time-integrated illuminance Luminous energy density ω v: lumen ...

  5. Luminous intensity - Wikipedia

    en.wikipedia.org/wiki/Luminous_intensity

    lux (= lumen per square metre) lx (= lm/m 2) L −2 ⋅J: Luminous flux incident on a surface Luminous exitance, luminous emittance M v: lumen per square metre lm/m 2: L −2 ⋅J: Luminous flux emitted from a surface Luminous exposure: H v: lux second: lx⋅s L −2 ⋅T⋅J: Time-integrated illuminance Luminous energy density ω v: lumen ...

  6. Talk:Lumen (unit) - Wikipedia

    en.wikipedia.org/wiki/Talk:Lumen_(unit)

    A standard 100 watt incandescent light bulb emits approximately 1700 lumens in North America and around 1300 lumens in 220 V areas of the world. See luminous efficacy for the specific efficiency of various types of electric light sources.

  7. Category:Canon calculators - Wikipedia

    en.wikipedia.org/wiki/Category:Canon_calculators

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  8. Luminous flux - Wikipedia

    en.wikipedia.org/wiki/Luminous_flux

    Luminous flux (in lumens) is a measure of the total amount of light a lamp puts out. The luminous intensity (in candelas) is a measure of how bright the beam in a particular direction is. 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 ...

  9. Lumen maintenance - Wikipedia

    en.wikipedia.org/wiki/Lumen_maintenance

    Lumen maintenance is the most useful gauge to determine the lifetime or useful light output rating of an LED light source. Unlike traditional light sources such as incandescent lamps, LEDs rarely fail outright and instead continue to emit light, albeit at slowly diminishing rate over time. [ 1 ]