8539.21.40.40 - Of a power less than 500 W

This HTS subcategory, 8539.21.40.40, specifically classifies tungsten halogen filament lamps designed for a power output of less than 500 Watts. These lamps are a type of incandescent lamp that utilizes a halogen gas to regenerate the filament, extending its life and maintaining its brightness compared to traditional incandescent bulbs. Common examples include those used in residential lighting fixtures, automotive headlights, and specialized task lighting where a compact and efficient light source is required.

The primary distinguishing factor for this category is its power rating. It is distinct from its sibling category, 8539.21.40.80, which covers tungsten halogen filament lamps with a power output of 500 Watts or more. Therefore, the wattage is the critical criterion for differentiating between these two classifications. The physical size, filament type, and bulb material, while contributing to the lamp's overall design, are secondary to the power specification when determining classification at this level.

As this subcategory represents a leaf node, there are no further subdivisions. Classification within this specific HTS code is determined by confirming the product is a tungsten halogen filament lamp and that its power consumption is definitively below 500 Watts. If a tungsten halogen lamp meets these criteria, it will be classified under this heading.