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  2. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    4 49 F49T5 Retrofit replacement for 45.8 in T5HO 54 W T8 1.0, 25 4 25 F32T8/25w Retrofit replacement for 4 ft T8 32 W T8 1.0, 25 4 28 F28T8 F32T8/28w Retrofit replacement for 4 ft T8 32 W T8 1.0, 25 4 30 F32T8/ES Retrofit replacement for 4 ft T8 32 W T8: 1.0, 25: 2: 17 F17T8: Ballast-swap replacement for 2 ft T12 20 W T8 1.0, 25 3 25 F25T8

  3. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    1 watt 9 volt three chips SMD phosphor based white LED Among the challenges being faced to improve the efficiency of LED-based white light sources is the development of more efficient phosphors. As of 2010, the most efficient yellow phosphor is still the YAG phosphor, with less than 10% Stokes shift loss.

  4. Recessed light - Wikipedia

    en.wikipedia.org/wiki/Recessed_light

    The housings come in various sizes based on the diameter of the circular opening where the lamp is installed. The most commonly used sizes are 4, 5 and 6 inches in diameter, with 4 inch IC New Construction units less readily available at present. Smaller housings (2 and 3 inch) are also available for specialized uses.

  5. In first postelection news conference, an upbeat Trump ... - AOL

    www.aol.com/news/first-post-election-news...

    President-elect Donald Trump was upbeat at his first postelection news conference Monday, saying there was a big difference from when he took office in 2016: Some of his former adversaries are now ...

  6. On Today's Date: Halsey's Typhoon U.S. Navy's Worst Natural ...

    www.aol.com/news/todays-date-halseys-typhoon-u...

    But near the end of World War II, those meteorological linchpins weren't available, and it led to a tragic decision that cost hundreds of lives. On December 17, 1944, ...

  7. Retrofitting - Wikipedia

    en.wikipedia.org/wiki/Retrofitting

    Retrofitting is the addition of new technology or features to older systems. Retrofits can happen for a number of reasons, for example with big capital expenditures like naval vessels, military equipment or manufacturing plants, businesses or governments may retrofit in order to reduce the need to replace a system entirely.