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Halogen lamp (105 W) for replacement purposes with an E27 screw base A close-up of a halogen lamp capsule. A halogen lamp (also called tungsten halogen, quartz-halogen, and quartz iodine lamp) is an incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of an inert gas and a ...
Group 3 (For replacement purposes only) Category Cap (Base) Filaments Nominal power Comments Image C21W SV8.5 1 12 V: 21 W Old designation: C15, for reversing lamp only H2 X511 1 12 V / 55 W ECE nominal luminous flux: 1800lm ±15% Deleted from Reg 37 H14 2 12 V: 60 / 55 W P38t Japan ECE nominal luminous flux: 1,750 / 1,150 lm ±15% P19W PGU20-1 1
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.
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 ...
The halogen lamp can operate its filament at a higher temperature than a standard gas filled lamp of similar power without loss of operating life. Such bulbs are much smaller than normal incandescent bulbs, and are widely used where intense illumination is needed in a limited space. Fiber-optic lamps for optical microscopy is one typical ...
Lamp bulbs with dual carbon filaments were built as early as 1902 to allow adjustable lighting levels. [1] Certain compact fluorescent lamp bulbs are designed to replace 3-way incandescent bulbs, [2] and have an extra contact and circuitry to dim to a similar light level. In recent years, LED 3-way bulbs have become available as well. [3]
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