3641  Electric Lamp Bulbs and Tubes

Establishments primarily engaged in manufacturing electric bulbs, tubes,
and related light sources. Important products of this industry include
incandescent filament lamps, vapor and fluorescent lamps, photoflash and
photoflood lamps, and electrotherapeutic lamp units for ultraviolet and
infrared radiation. Establishments primarily engaged in manufacturing glass
blanks for bulbs are classified in industry 3229.