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  2. Cannabis cultivation - Wikipedia

    en.wikipedia.org/wiki/Cannabis_cultivation

    Often, the distance between lamp and plant is in the range of 0.6 m (2 ft) with high pressure sodium lamps, to 10 cm (4 in) with other lamps, such as compact, large and high-output fluorescent lamps. With proper cooling any light type can be moved extremely close to plants to combat the inverse square law, but there are reasons to keep some ...

  3. Recessed light - Wikipedia

    en.wikipedia.org/wiki/Recessed_light

    When installed it appears to have light shining from a hole in the ceiling, concentrating the light in a downward direction as a broad floodlight or narrow spotlight. Different types of recessed lighting in a warehouse "Pot light" or "canister light" implies the hole is circular and the lighting fixture is cylindrical, like a pot or canister.

  4. Grow light - Wikipedia

    en.wikipedia.org/wiki/Grow_light

    Ficus plant grown under a white LED grow light. A grow light is an electric light that can help plants grow. Grow lights either attempt to provide a light spectrum similar to that of the sun, or to provide a spectrum that is more tailored to the needs of the plants being cultivated (typically a varying combination of red and blue light, which generally appears pink to purple to the human eye).

  5. North American railroad signals - Wikipedia

    en.wikipedia.org/wiki/North_American_railroad...

    The early color light signals were visible for only about half that distance (2,500 feet or 760 metres) while using about the same electrical current, then a major concern in "primary battery territory". By 1925, the development of "high-transmission colors" of railroad glassware by Gage and Corning Glass improved this limited distance to an ...

  6. Light fixture - Wikipedia

    en.wikipedia.org/wiki/Light_fixture

    A light fixture (US English), light fitting (UK English), or luminaire is an electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment. [1] All light fixtures have a fixture body and one or more lamps.

  7. Trump’s extreme dislike of FBI directors, explained - AOL

    www.aol.com/news/trump-extreme-dislike-fbi...

    President-elect Donald Trump is still putting together his Cabinet for his second term, and many other government positions will open up when he takes the oath of office in January.

  8. Justice Department says Mississippi Senate paid a Black ...

    www.aol.com/justice-department-says-mississippi...

    The Justice Department said it is seeking back pay and compensatory damages, in addition to other relief, from the state Senate.

  9. 3-way lamp - Wikipedia

    en.wikipedia.org/wiki/3-way_lamp

    A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...

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