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230/240-volt incandescent light bulb with E27 screw base. Edison screw (ES) is a standard lightbulb socket for electric light bulbs. It was developed by Thomas Edison (1847–1931), patented in 1881, [1] and was licensed in 1909 under General Electric's Mazda trademark.
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 ...
E39d Three-way Mogul (modified socket with additional ring contact for 3-way lamps) E40s European; Skirted (PAR-38) The light bulb commonly used since the early 20th century for general-purpose lighting applications, with a pear-like shape and an Edison screw base, is referred to as an "A-series light bulb." This most common general purpose ...
Typical diameters are T12 or T38 (1 + 1 ⁄ 2 in or 38 mm) for larger, often less efficient lamps, T8 or T26 (1 in or 25 mm) for smaller and often energy-saving lamps, and T5 or T16 (5 ⁄ 8 in or 16 mm) for very small lamps, which may even operate from a battery-powered device.
The GU24 fitting is intended to maintain the energy efficiency of the light by preventing an occupant from using an incandescent bulb instead of a CFL. Adapters to use incandescent bulbs in a GU24 fitting are illegal in the State of California as they would be a fire hazard in fixtures designed for the lower heat output of a CFL bulb.
Less than 5% of the power consumed by a typical incandescent light bulb is converted into visible light, with most of the rest being emitted as invisible infrared radiation. [ 1 ] [ 78 ] Light bulbs are rated by their luminous efficacy , which is the ratio of the amount of visible light emitted ( luminous flux ) to the electrical power consumed ...
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