Luminance (Light measurement)

Luminance is a measurement of how much light is emitted or reflected from a surface in a given direction, essentially indicating how bright that surface appears to the eye. It is measured in units called candelas per square meter (cd/m²). Higher luminance means a surface looks brighter, while lower luminance appears dimmer. This measurement is important in fields like lighting design and display technology, helping to ensure that screens, signs, and environments are visible and visually comfortable under various lighting conditions.