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  2. Germicidal lamp - Wikipedia

    en.wikipedia.org/wiki/Germicidal_lamp

    Low-pressure mercury lamps are very similar to a fluorescent lamp, with a wavelength of 253.7 nm (1182.5 THz).. The most common form of germicidal lamp looks similar to an ordinary fluorescent lamp but the tube contains no fluorescent phosphor.

  3. Dropped ceiling - Wikipedia

    en.wikipedia.org/wiki/Dropped_ceiling

    Dropped ceiling featuring ceiling tiles, lights, air diffusers, smoke detector, and more Dropped ceiling with ceiling tile light fixture. A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling.

  4. Multifaceted reflector - Wikipedia

    en.wikipedia.org/wiki/Multifaceted_reflector

    Left to right: MR16 with GU10 base, MR16 with GU5.3 base, MR11 with GU4 or GZ4 base Line drawing of an LED MR16 lamp, with a heatsink rather than a reflector. A multifaceted reflector (often abbreviated MR) light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps.

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