Candela

Candela is a unit used to measure visible light intensity as perceived by the human eye. It quantifies how bright a light source appears from the perspective of an observer. Essentially, one candela represents the light emitted in a specific direction that appears as bright as a standard candle when viewed from a distance. This measurement helps compare the brightness of lighting devices, such as bulbs and LEDs, ensuring appropriate illumination levels for different settings. Candela is part of the International System of Units (SI), providing a standardized way to describe and compare light source brightness.