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infrared radiation
1. Electromagnetic radiation whose wavelengths lie in the range from 0.75 micrometer to 1000 micrometers; invisible long wavelength radiation (heat) capable of producing a thermal or photovoltaic effect, though less effective than visible light.
2. The part of the electromagnetic spectrum that lies between the microwave and visible wavelengths.
This entry is located in the following unit: Photovoltaic Conversion Efficiency Terms + (page 10)