What is the minimum percentage of the illuminance level that corridor lighting should have compared to adjacent areas?

The correct answer indicates that corridor lighting should have a minimum illuminance level of 20% compared to adjacent areas. This standard is primarily aimed at ensuring safety and visibility in transition spaces like corridors, where varying lighting levels can create confusion or hazards.

Having the corridor lighting at 20% of the illuminance level of adjacent areas helps to provide enough contrast for individuals moving from one area to another. This percentage is a commonly accepted benchmark that ensures that corridors are adequately lit without causing excessive brightness or glare that could be uncomfortable for users. Proper illumination in corridors can help prevent accidents, enhance orientation, and contribute to a feeling of security, especially in environments such as hospitals, offices, or schools where foot traffic is common.

The percentage also allows for a gradual transition in lighting levels, rather than abrupt changes that could be disorienting. In summary, maintaining corridor lighting at 20% of adjacent areas optimizes safety, efficiency, and comfort for individuals navigating those spaces.