8539.31.00.40 - 1.2 m, straight tube, of a power 30 W or more but not exceeding 40 W

This classification covers specific types of fluorescent, hot cathode discharge lamps. The key defining characteristics for items falling under HTS code 8539.31.00.40 are their physical dimensions, specifically being a straight tube measuring 1.2 meters in length, and their electrical power consumption, which must be rated at 30 watts or more but not exceeding 40 watts. These criteria are crucial for distinguishing these particular lamps from other fluorescent lighting products.

While this category focuses on straight tube fluorescent lamps within a defined power range, other subcategories within discharge lamps exist to classify different types of lighting technologies or form factors. For example, other categories might encompass different lamp shapes, gas-filled discharge lamps other than fluorescent, or those with distinct operating mechanisms, all distinguished by their unique technical specifications and intended applications. The specific power and length requirements for this code ensure precise classification of these common fluorescent lighting units.