8539.32.00.40 - Mercury vapor

This HTS category, 8539.32.00.40, specifically covers mercury vapor discharge lamps. These lamps utilize the excitation of mercury vapor to produce light, typically emitting a bluish-white glow. They are characterized by their ability to provide high luminous efficacy and long operational life, making them suitable for various lighting applications such as streetlights, industrial lighting, and horticultural lighting.

Within the broader group of "Mercury or sodium vapor lamps; metal halide lamps," this subcategory is distinguished from its siblings by the specific vapor used for light emission. While the sibling category 8539.32.00.20 covers sodium vapor lamps, which emit a characteristic yellow or orange light, and 8539.32.00.90 encompasses other types of metal halide lamps or lamps not fitting the mercury or sodium vapor description, this node is exclusively for those employing mercury vapor.

As a leaf node, this classification does not have further subcategories. Therefore, classification into 8539.32.00.40 relies on the definitive presence and operational principle of mercury vapor as the primary element for light generation within a discharge lamp. Importers and exporters should ensure that the lamps they are classifying are indeed mercury vapor types, distinguishing them from other discharge lamp technologies like sodium vapor or metal halide.