Tungsten light
From The Glossary of Digital Photography
More commonly known as incandescent light. Light that is produced by standard household incandescent light bulbs. In point of fact, tungsten light is produced by an incandescent light bulb with a tungsten filament, but the terms have come to be used interchangeably. The first incandescent light bulbs used carbon powder and platinum filaments. There were also incandescent lights made with carbon rods. A tungsten light bulb works by heating a tungsten filament wire inside a clear or frosted bulb by passing a current through the filament. The inside of the bulb is filled with an inert gas, such as nitrogen, so the tungsten filament glows white hot at temperatures of 2,000 K to 3,000 K or more. Since oxygen is not an inert gas, it is not is present, so the filament glows but does not burn. The white-hot filament produces both light and heat. When photographing with tungsten light, the warmer color of the light must be taken into account. Many digital cameras have a tungsten white balance setting; alternatively, the images can be adjusted after-the-fact using image-manipulation software.
