Classification turns on the lamp's primary designed function and spectral output, not incidental visible emission. A lamp engineered to produce ultraviolet radiation as its principal output — such as a germicidal or UV-curing lamp — belongs in this heading even if some visible light is emitted. Importers uncertain about borderline cases should seek a CBP binding ruling based on technical specifications.

Industrial process heating (paint curing, food processing, plastics forming), medical and therapeutic devices, and security/surveillance systems are the primary end-use sectors. Infrared lamps for industrial heating applications are often specified by wattage, wavelength band (near-, mid-, or far-infrared), and physical form factor, all of which can affect tariff classification at the detailed HTS level.