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Colors using a halophosphate formulation are usually indicated by WW for warm white, W for (neutral) white, CW for cool white, and D for the bluish daylight white. Philips and Osram use numeric color codes for tri-phosphor and multi-phosphor colors.
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 ...
Color theory shows that mixing the primary colors of light will make white light. Therefore, through color mixing, LED's can form a wide variety of colors from white light to deep primary colors to many others. This reduces the time taken to change the color of an already hung fixture. The introduction of the LED allows much more variety of ...
In practice, color temperature is most meaningful for light sources that correspond somewhat closely to the color of some black body, i.e., light in a range going from red to orange to yellow to white to bluish white. Although the concept of correlated color temperature extends the definition to any visible light, the color temperature of a ...
A final class of white LED with mixed light is dim-to-warm. These are ordinary 2700K white LED bulbs with a small red LED that turns on when the bulb is dimmed. Doing so makes the color warmer, emulating an incandescent light bulb. [39]
In situations where sunlight or other specular light is available, a white foam reflector is often used to accomplish the same effect as a PAR array. PAR cans are being replaced in some stage applications by LED stage lighting , which use less electric power and produce a wide array of saturated colors without the use of color filters, when ...
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