NEMA LSD 41-2020提供了含有放射性物质的灯具的装运和标签信息。绝大多数灯泡，也被照明行业称为灯具，不含任何放射性物质。某些类型的灯含有极少量的放射性同位素，有助于改善灯的点火、寿命和流明维护。

NEMA LSD 41-2020 provides information about shipping and labeling of lamps that contain radioactive substances. The vast majority of light bulbs, also called lamps by the lighting industry, do not contain any radioactive materials. Certain types contain very small amounts of radioactive isotopes which help to improve lamp ignition, lamp life and lumen maintenance.