8539.31.00.60 - With a single screw-in base

This HTS classification, 8539.31.00.60, specifically designates fluorescent discharge lamps that utilize a single screw-in base for their electrical connection. These lamps are a common type of lighting, often found in residential, commercial, and industrial settings, characterized by their gas-discharge technology and the familiar threaded base that ensures a secure fit into compatible lamp holders. The "fluorescent, hot cathode" designation indicates the operational principle, where a filament heats up to initiate the discharge process within the tube, producing light through a phosphor coating.

This category is distinguished from its sibling, 8539.31.00.50, by the method of electrical connection. While both are fluorescent discharge lamps with a single base, the former relies on a screw-in mechanism, whereas 8539.31.00.50 covers those with a plug-in style base, which typically involves pins or prongs that insert into a socket. Another sibling, 8539.31.00.70, acts as a residual category for other fluorescent discharge lamps not otherwise specified, encompassing any variations that do not fit the screw-in or plug-in base criteria.

As this is a leaf node within the HTS, there are no further subdivisions under 8539.31.00.60. Therefore, classification under this code is based solely on the product being a fluorescent, hot cathode discharge lamp with a single screw-in base. Importers and exporters should ensure that the physical characteristics and intended use align precisely with this description to ensure accurate customs declaration and compliance.