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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Incandescent/Tungsten Light

The term incandescent or tungsten illumination is usually applied to the direct descendents of Thomas Edison’s original electric lamp. Such lights consist of a glass bulb that contains a vacuum, or is filled with a halogen gas, and contains a tungsten filament that is heated by an electrical current, producing photons and heat. Tungsten-halogen lamps are a variation on the basic light bulb, using a more rugged (and longer-lasting) filament that can be heated to a higher temperature, housed in a thicker glass or quartz envelope, and filled with iodine or bromine (“halogen”) gases. The higher temperature allows tungsten-halogen (or quartz-halogen/quartz-iodine, depending on their construction) lamps to burn “hotter” ...

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