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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. [2]
The latter use a standard light switch, and the on-board electronics chooses the light output level based on the number of times the switch is turned on and off quickly. Dimmable CFLs are not a 100% replacement for incandescent fixtures that are dimmed for "mood scenes" such as wall sconces in a dining area.
Halogen lamps made for 12 to 24 volt operation have good light outputs, and the very compact filaments are particularly beneficial for optical control (see picture). The ranges of multifaceted reflector "MR" lamps of 20–50 watts were originally conceived for the projection of 8 mm film, but are now widely used for display lighting and in the ...
His light bulbs are on display in the museum of the Château de Blois. [a] In 1859, Moses G. Farmer built an electric incandescent light bulb using a platinum filament. [24] Thomas Edison later saw one of these bulbs in a shop in Boston, and asked Farmer for advice on the electric light business. Alexander Lodygin on 1951 Soviet postal stamp
Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]
While early floppy disks had a nominal package size of 5 1 ⁄ 4 inches (approximately 130 mm), the nominal design diameter of the replacement "3 1 ⁄ 2 inch" disks was actually 90 mm. CDs and DVDs are 120 mm in diameter, but their size is rarely mentioned; mini CDs are sometimes called 80 mm CDs.