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An incandescent light bulb, ... Color temperature is approximately proportional to V 0.42 [112] A 5% reduction in voltage will double the life of the bulb, but reduce ...
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.
Incandescence is exploited in incandescent light bulbs, in which a filament is heated to a temperature at which a fraction of the radiation falls in the visible spectrum. The majority of the radiation, however, is emitted in the infrared part of the spectrum, rendering incandescent lights relatively inefficient as a light source. [3]
These bulbs should maintain the same color temperature, even as the brightness shifts from high to low, as opposed to incandescent bulbs that automatically become warmer as they dim.
Many consumers mistakenly believe the new standards, included in the Energy Independence and Security Act of 2007, ban the sale of incandescent bulbs. Not true. Rather, the federal government has ...
The color temperature of incandescent bulbs – essentially the actual temperature of the hot filament – decreases as the voltage applied is reduced by a dimmer, and the light becomes visibly "warmer"; this does not happen with other technologies. However, Philips has designed LED bulbs that mimic this phenomenon when dimmed. [169]
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