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Infrared light converts to heat energy with high efficiency. Consider a fire. Infrared energy is produced, verified by the yellow-orange to red color you see. The heat produced by this fire is enormous. As the Department of Energy notes, "Almost all infrared wavelengths are absorbed in the skin and thus creates the sensation of heat very efficiently."
Source:
Department of Energy.gov: Ask a Scientist
Solaire Infrared Grilling Systems.biz: What is Infrared?
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