Luminance

Luminance  measured in candelas per square meter1 (cd/m²) refers to the measurable brightness of a surface, such as a lamp, luminaire, photoluminescent material, or reflective surface, when viewed from a specific direction.

In the context of emergency lighting and exit signs, luminance is a critical factor that ensures visibility and legibility during emergencies, particularly in low-light or smoke-filled environments. It quantifies the light emitted or reflected by these surfaces, allowing occupants to locate and navigate toward safe exits effectively.

Proper luminance levels, as defined by standards like AS/NZS 2293, are essential for the reliable performance of emergency lighting and exit signage, ensuring compliance and occupant safety during evacuation scenarios.

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  Candelas per square meter (cd/m²) is a unit of measurement that represents the intensity of light emitted or reflected from a surface per unit area in a particular direction.