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  2. John Ott - Wikipedia

    en.wikipedia.org/wiki/John_Ott

    John Nash Ott (23 October 1909 – 6 April 2000 [1]) was a photo-researcher, writer, photographer, and cinematographer who was an early adopter of many modern photographic practices, including time-lapse photography and full-spectrum lighting.

  3. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    If the first digit on a lamp says 8, then the CRI of that lamp will be approximately 85. The last two digits indicate the color temperature of the lamp in kelvins (K). For example, if the last two digits on a lamp say 41, that lamp's color temperature will be 4100 K, which is a common tri-phosphor cool white fluorescent lamp.

  4. Electrical ballast - Wikipedia

    en.wikipedia.org/wiki/Electrical_ballast

    The ballast in such systems can equally be a resistor. A number of fluorescent lamp fittings used a filament lamp as the ballast in the late 1950s through to the 1960s. Special lamps were manufactured that were rated at 170 volts and 120 watts. The lamp had a thermal starter built into the 4 pin base.

  5. Trump rolls back standards for water-using appliances, light ...

    www.aol.com/news/trump-rolls-back-standards...

    WASHINGTON (Reuters) -President Donald Trump on Tuesday moved to revert to older standards for light bulbs as well as toilets, showers and other water-using appliances, a day after signing an ...

  6. High-intensity discharge lamp - Wikipedia

    en.wikipedia.org/wiki/High-intensity_discharge_lamp

    Krypton-85 is a gas and is found mixed in with the argon, which is in the arc tube of the lamp. [8] The thorium, which is a solid, is used in the electrodes. [8] These isotopes produce ionizing radiation of alpha and beta type. This radiation causes high ionization inside the lamp without being able to escape from the lamp. [6]

  7. Metal-halide lamp - Wikipedia

    en.wikipedia.org/wiki/Metal-halide_lamp

    Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]

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