8539.31.00 - Fluorescent, hot cathode

HTS Code 8539.31.00 specifically classifies fluorescent discharge lamps that utilize a hot cathode. These lamps operate by passing an electric current through a gas, which excites a fluorescent coating on the inside of the tube, producing light. The "hot cathode" designation is a key differentiator, referring to the electrodes that are heated to facilitate electron emission, a characteristic shared by various types of fluorescent lighting.

This category distinguishes itself from its siblings primarily by the type of discharge lamp and the specific technology employed. Unlike sibling categories such as 8539.32.00, which covers mercury or sodium vapor lamps and metal halide lamps (types of high-intensity discharge lamps), 8539.31.00 is exclusively for fluorescent lighting. It also differs from the broader "Other" category under 8539.39, which would encompass discharge lamps not otherwise specified.

Within the 8539.31.00 classification, further subcategories provide more granular detail for specific types of fluorescent lamps. For example, 8539.31.00.40 addresses fluorescent tubes with defined physical characteristics, such as a length of 1.2 meters and a power range of 30 to 40 watts. The existence of these subcategories highlights the importance of precise specifications, including dimensions and electrical ratings, for accurate customs classification of fluorescent lighting products.