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Infrared heat lamps have very widely application:

An infrared heat lamp is an incandescent light bulb that is used for the principal purpose of creating heat. These are also called infrared bulbs, heat lamps, halogen lamps and infrared heaters. Many heat lamps include a red filter to minimize the amount of visible light emitted while still emitting a decent level of infrared heat. ... Read more

In general, objects emit infrared radiation across a spectrum of wavelengths, but sometimes only a limited region of the spectrum is of interest because sensors usually collect radiation only within a specific bandwidth. Thermal infrared radiation also has a maximum emission wavelength, which is inversely proportional to the absolute temperature of object, in accordance with ... Read more