GB 14778-1993

This standard specifies the chromaticity and photometric requirements for colored light signals used to convey safety information, such as red for prohibition or danger, yellow for warning, and green for safe conditions. It is applied in industrial facilities, transportation systems, and public buildings in China to ensure consistent and recognizable safety signaling across equipment, control panels, and emergency exits. The standard governs the design and testing of safety lights to prevent misinterpretation in critical environments like factories, railways, and construction sites.