8539.49.00.40 - Ultraviolet lamps

This HTS category, 8539.49.00.40, specifically encompasses ultraviolet (UV) lamps. These lamps are designed to emit electromagnetic radiation primarily in the ultraviolet spectrum, a range beyond visible light. Their applications are diverse, including but not limited to, germicidal sterilization, curing of inks and resins, fluorescent analysis, and therapeutic uses in medicine. The key defining characteristic for classification under this code is the primary output being UV radiation, distinguishing them from lamps that primarily produce visible light or infrared radiation.

While the preceding level within 8539.49 covers "Other" ultraviolet or infrared lamps and arc lamps, this subcategory isolates the ultraviolet lamps specifically. The sibling category, 8539.49.00.80, also falls under "Other," but it is designated for any remaining ultraviolet or infrared lamps and arc lamps that do not fit the specific exclusion of UV lamps covered here, or other specific subcategories if they existed. Therefore, classification hinges on the definitive identification of the lamp's UV emission as its principal function.

As this is a leaf node in the HTS classification, there are no further subcategories. This means that once a product is determined to be an ultraviolet lamp, it will be classified under this code, provided it does not meet the criteria for a more specific or higher-level heading or subheading that might be defined in other parts of the tariff schedule (though unlikely within the direct lineage of 8539.49). Therefore, the classification relies on the technical specification and intended purpose of the lamp to confirm its ultraviolet radiation output as the primary characteristic.