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  2. Incandescent light bulb - Wikipedia

    en.wikipedia.org/wiki/Incandescent_light_bulb

    An incandescent light bulb, ... Coiled coil filament of a 200-watt incandescent lightbulb highly magnified ... Such a lamp may achieve up to 22 lumens per watt ...

  3. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Sources that depend on thermal emission from a solid filament, such as incandescent light bulbs, tend to have low overall efficacy because, as explained by Donald L. Klipstein, "An ideal thermal radiator produces visible light most efficiently at temperatures around 6300 °C (6600 K or 11,500 °F). Even at this high temperature, a lot of the ...

  4. Lumen (unit) - Wikipedia

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

    Lamps used for lighting are commonly labelled with their light output in lumens; in many jurisdictions, this is required by law. A 23 W spiral compact fluorescent lamp emits about 1,400–1,600 lm. [4] [5] Many compact fluorescent lamps and other alternative light sources are labelled as being equivalent to an incandescent bulb with a specific ...

  5. 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 ...

  6. Maglite - Wikipedia

    en.wikipedia.org/wiki/Maglite

    2012: The V4 was released with a newly developed electronic switch enabling a Multi Mode operation and a slightly more powerful bulb producing an output of 245 Lumens. 2012: In August, Maglite announced several new models including an LED version of the Solitaire, a Mini Maglite LED 2 AAA and a new version of the 2D LED termed the 2D LED Pro ...

  7. Orders of magnitude (illuminance) - Wikipedia

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

    < 200 lux: Extreme of darkest storm clouds, midday 400 lux: Sunrise or sunset on a clear day (ambient illumination) 10 4: 10 kilolux: 10–25 kilolux: Typical overcast day, midday 20 kilolux: Shade illuminated by entire clear blue sky, midday 10 5: 100 kilolux 110 kilolux: Bright sunlight 120 kilolux: Brightest sunlight

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