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  2. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Even at this high temperature, a lot of the radiation is either infrared or ultraviolet, and the theoretical luminous [efficacy] is 95 lumens per watt. No substance is solid and usable as a light bulb filament at temperatures anywhere close to this. The surface of the sun is not quite that hot."

  3. L Prize - Wikipedia

    en.wikipedia.org/wiki/L_Prize

    The L-Prize competition was designed to spur development of LED light replacements for 60W incandescent lamps and PAR38 halogen lamps as well as an ultra-efficient "21st Century Lamp". [1] It was established by the United States Department of Energy (DOE) as directed by the Energy Independence and Security Act of 2007. The original competition ...

  4. Centennial Light - Wikipedia

    en.wikipedia.org/wiki/Centennial_Light

    The pendant light at Fire Station #6 in which the bulb is installed. The Centennial Light was originally a 60-watt bulb, but has since dimmed significantly and is now as bright as a 4-watt bulb. [7] [8] [9] The hand-blown, carbon-filament common light bulb was invented by Adolphe Chaillet, a French engineer who filed a patent for this socket ...

  5. Talk:Lumen (unit) - Wikipedia

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

    . . . the following light bulbs all produce roughly the same amount of light (450 lumens): 40-watt incandescent, 29-watt halogen, 11-watt compact fluorescent (CFL) and 9-watt LED. It's still important to pay attention to wattage to make sure you don't exceed the recommended level for your lamp, but it's increasingly unlikely that you'll exceed ...

  6. Lumen (unit) - Wikipedia

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

    The same 1,000 lumens, spread out over ten square metres, produces a dimmer illuminance of only 100 lux. In equation form, 1 lx = 1 lm/m 2. A source radiating a power of one watt of light in the color for which the eye is most efficient (a wavelength of 555 nm, in the green region of the optical spectrum) has luminous flux of 683 lumens.

  7. Mogul lamp - Wikipedia

    en.wikipedia.org/wiki/Mogul_lamp

    One controls the three-way center bulb, and the other turns on one, two, or all three (or four) of the peripheral bulbs. The center bulb may be very high power (often a three-way, 100-200-300 watt bulb), where the others are usually 60 watts or less. Some models have a night light in the base operated by a foot switch. One model turns the ...

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