| Tech Note 1-2: Color of Light | ||
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Visible light ranges from blue at 400 nanometers to red at 700 (as high as 750) nanometers in wavelength. Light Emitting Diodes (LED's) typically emit a narrow band of a single color while Incandescent Filament Lamps emit a broad spectrum that begins in the 400 nanometer range and extends far into the Infrared region. Incandescent lamps emit "white" light, but it is important to better define what "white" means. An approximate designation is used by specifying the temperature of a hot (black body) emitter whose color almost matches that of the light. The color temperature of daylight is about 6000 deg Kelvin (K).and that of tungten lamps range from 2300 to 3300 deg K. The lower the color temperature, the more yellow a white light is. The higher the color temperature, the more blue a white light is. |
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This graph shows four of the Lumitex LED's color distribution on a wavelength scale. There is a tolerance band to these colors as each LED will not be exactly the same color. | |
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| Another way of looking at color is on a "u" vs. "v" scale. The curved line that starts in the yellow-red region and goes through the white in the middle represents white light at various color temperatures. This data can also be represented on an "x" vs. "y" scale. Sometimes LED manufacturers will provide xy tolerance boxes for the color outputs of their LED's. | ||
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