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The Kelvin color temperature scale ranges from 1000K (amber) to 3000K (yellow) to 5500K (white) to 8000K (blue) to 12000K (purple). HID Lamp Color Temperature Range. HID lamps produce different colors of light primarily through the use of various metal additives in the lamp's arc tube and the physics of the gas discharge process. [11]
The color temperature scale describes only the color of light emitted by a light source, which may actually be at a different (and often much lower) temperature. [ 1 ] [ 2 ] Color temperature has applications in lighting , [ 3 ] photography , [ 4 ] videography , [ 5 ] publishing , [ 6 ] manufacturing , [ 7 ] astrophysics , [ 8 ] and other fields.
These lamps produce light through a high-intensity discharge (HID) by passing an electric arc through vapourized high-pressure mercury and metal halide compounds. [15] Their disadvantages include high power consumption, [ 1 ] high electronic driver costs, [ 1 ] and short life cycles. [ 1 ]
Like all HID lamps, HQI lamps operate under high pressure and temperature, and require special light fixtures for safe use. HQI lamps can produce different color temperatures when manufactured with different metal halides. They are relatively efficient light sources producing a high lumen per watt ratio (approximately 6x that of incandescent ...
With HMI bulbs, color temperature varies significantly with lamp age. A new bulb generally will output at a color temperature close to 15,000 K during its first few hours. As the bulb ages, the color temperature reaches its nominal value of around 5600 K or 6000 K. With age, the arc length becomes larger as more of the electrodes burn away.
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