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  2. 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.

  3. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Sources that depend on thermal emission from a solid filament, such as incandescent light bulbs, tend to have low overall efficacy because, as explained by Donald L. Klipstein, "An ideal thermal radiator produces visible light most efficiently at temperatures around 6300 °C (6600 K or 11,500 °F). Even at this high temperature, a lot of the ...

  4. Phase-out of incandescent light bulbs - Wikipedia

    en.wikipedia.org/wiki/Phase-out_of_incandescent...

    60 W incandescent light bulb with energy efficiency class E Equivalent 42 W halogen incandescent light bulb with efficiency class C Compact fluorescent lamp LED lamp circa 2021. Various governments have passed legislation to phase out manufacturing or importation of incandescent light bulbs for general lighting in favor of more energy-efficient ...

  5. Bi-pin lamp base - Wikipedia

    en.wikipedia.org/wiki/Bi-pin_lamp_base

    The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...

  6. List of automotive light bulb types - Wikipedia

    en.wikipedia.org/wiki/List_of_automotive_light...

    Available with P45t base to upgrade old headlamps designed for R2 bulb H7 1 12 V: 55 W 24 V: 70 W PX26d USA, Japan 12V: ECE nominal luminous flux: 1,500 lm ±10% H8 1 12 V: 35 W PGJ19-1 USA ECE nominal luminous flux: 800 lm ±15% H8B 1 12 V: 35 W PGJY19-1 USA H9 1 12 V: 65 W PGJ19-5 USA H9B 1 12 V: 65 W PGJY19-5 USA H10 1 12 V: 42 W PY20d USA

  7. Parabolic aluminized reflector - Wikipedia

    en.wikipedia.org/wiki/Parabolic_aluminized_reflector

    For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1] The size of rectangular PAR lamps is expressed as the letters REC followed by the reflector's mouth height, the letter "X", and the reflector's mouth width—with both dimensions in millimeters. For example, REC142X200 lamps are 142 high and 200 mm wide. [2] [3]

  8. A-series light bulb - Wikipedia

    en.wikipedia.org/wiki/A-series_light_bulb

    The most commonly used A-series light bulb type is an A60 bulb [7] (or its inch-based equivalent, the A19 bulb [2] [4]), which is 60 mm (19 ⁄ 8 in or 2 + 3 ⁄ 8 in) wide at its widest point [3] and approximately 110 mm (4 + 3 ⁄ 8 in) in length. [8] Other sizes with a data sheet in IEC 60064 are A50, A55, A67, A68, A71, A75, and A80.

  9. Mark IX - Wikipedia

    en.wikipedia.org/wiki/Mark_IX

    BL 9.2 inch gun Mk IX–X (1899), a British 9.2 inch coastal defence cannon; Armstrong Whitworth 12-inch 40-calibre naval gun Mark IX (1901), a British naval gun that was later used on land in the BL 12 inch Railway Gun; 21in Mk IX torpedo, a British 21-inch torpedo; Bliss-Leavitt Mark 9 torpedo (1915), an American 21-inch torpedo

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