lightbulb
lightbulb, electric incandescent lamp based on a glowing metallic filament enclosed within a glass shell filled with an inert gas such as nitrogen. See incandescent lamp; lamp.
This article was most recently revised and updated by Amy Tikkanen.
Citation Information
Article Title:
lightbulb
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
11 September 2026
Access Date:
November 13, 2026