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Light bulbs using coiled coil filaments are sometimes referred to as 'double-coil bulbs'. For a 60-watt 120-volt lamp, the uncoiled length of the tungsten filament is usually 580 millimetres (22.8 in), [76] and the filament diameter is 0.046 millimetres (0.0018 in). The advantage of the coiled coil is that evaporation of the tungsten filament ...
Philips Hue is a line of color-changing LED lamps and white bulbs which can be controlled wirelessly. The Philips Hue line of bulbs was the first smart bulb of its kind on the market. [3] The lamps are currently created and manufactured by Signify N.V., formerly the Philips Lighting division of Royal Philips N.V. [1] [4]
Fluorescent lamps in various embodiments. Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics.
The color of the light output can be adjusted by altering the ratio of the blue-emitting antimony dopant and orange-emitting manganese dopant. The color rendering ability of these older-style lamps is quite poor. Halophosphate phosphors were invented by A. H. McKeag et al. in 1942. "Natural sunshine" fluorescent light: Peaks with stars are ...
The color temperature of a light source is the temperature of a black body that has the same chromaticity (i.e. color) as the light source. A notional temperature, the correlated color temperature , the temperature of a black body that emits light of a hue that to human color perception most closely matches the light from the lamp, is assigned.
More contemporary "Edison light bulbs" are designed to replicate the same light color and bulb shape of the original, but offer a more energy-efficient version to Rosenzweig's popular vintage reproduction bulbs (modern tungsten coils are already more efficient).
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