Why did electric light bulb manufacturing require vacuum technology?

Electric light bulb manufacturing required vacuum technology primarily to prevent the filament from oxidizing and burning away quickly when heated to incandescence. By removing the air from the glass bulb, the vacuum environment allowed the filament to glow steadily without reacting with oxygen.1

In the early development of the incandescent lamp, inventors like Sir Joseph Wilson Swan and Thomas A. Edison utilized vacuum pumps to create an evacuated space for their carbon filaments. Without this vacuum, the high temperatures required for the filament to emit light would have caused it to oxidize and fail almost immediately.12

While early bulbs relied on a vacuum to protect the filament, later advancements in the 20th century involved filling bulbs with inert gas—such as argon or nitrogen—to further improve efficiency and prolong the life of tungsten filaments by reducing the migration of filament molecules to the glass.12