incandescent lightbulb

An incandescent light bulb is a type of lamp that produces light by heating a wire filament to a high temperature using an electric current. This glowing filament is enclosed within a glass shell, often filled with an inert gas to prevent the filament from oxidizing.123

The development of the incandescent lamp was a significant advancement in lighting technology. Early experiments in the 19th century led to the creation of practical incandescent bulbs, with inventors like Sir Joseph Wilson Swan and Thomas Alva Edison making key contributions. While initially inefficient, these bulbs soon became widely accepted, replacing older lighting methods like gas jets.4

Over time, improvements were made, such as the development of more efficient tungsten filaments and the introduction of inert gases within the bulb, which increased both efficiency and lifespan. Despite their widespread use, incandescent bulbs are less energy-efficient compared to newer technologies like fluorescent and LED lamps, leading to their gradual phase-out in many regions.43