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An incandescent lamp's light is thermal radiation, and the bulb approximates an ideal black-body radiator, so its color temperature is essentially the temperature of the filament. Thus a relatively low temperature emits a dull red and a high temperature emits the almost white of the traditional incandescent light bulb.
Color temperatures and example sources Temperature Source 1700 K Match flame, low pressure sodium lamps (LPS/SOX) 1850 K Candle flame, sunset/sunrise: 2400 K Standard incandescent lamps: 2550 K Soft white incandescent lamps 2700 K "Soft white" compact fluorescent and LED lamps 3000 K Warm white compact fluorescent and LED lamps 3200 K
General-purpose lighting requires a white light, emulating a black body at a specified temperature, from "warm white" (like an incandescent bulb) at 2700K, to "daylight" at around 6500K. The first LEDs emitted light in a very narrow band of wavelengths, of a color characteristic of the energy band gap of the semiconductor material used to make ...
A list of standardized illuminants, their CIE chromaticity coordinates (x,y) of a perfectly reflecting (or transmitting) diffuser, and their correlated color temperatures (CCTs) are given below. The CIE chromaticity coordinates are given for both the 2 degree field of view (1931) and the 10 degree field of view (1964). [ 1 ]
The White bulbs produce white light with a color temperature of 2700 K (warm); the White Ambiance bulbs produce white light of color temperature adjustable between 2200 K (warm soft white) and 6500 K (daylight). The White and Color Ambiance range can generate white light adjustable from 2000 K to 6500 K, and also adjustable colored light.
Halophosphate warm-white fluorescent: 2940 51 Halophosphate cool-white fluorescent 4230 64 Tri-phosphor warm-white fluorescent 2940 73 Halophosphate cool-daylight fluorescent 6430 76 "White" SON: 2700 82 Standard LED Lamp 2700–5000 83 Quartz metal halide: 4200 85 Tri-phosphor cool-white fluorescent: 4080 89 High-CRI LED lamp (blue LED) 2700 ...
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