Photo-luminescent escape path lights must be charged with the cabin lights on bright for how long?

Photo-luminescent escape path lights are designed to provide visibility and guidance in case of an emergency when the regular cabin lighting is reduced or fails. To ensure these lights function effectively, they must absorb light energy to reach adequate levels of luminosity.

Charging the photo-luminescent lights with the cabin lights on bright is essential for a sufficient duration to allow for optimal performance during an evacuation scenario. The requirement is set to 15 minutes, which allows the material within the escape path lights to fully charge and reach its maximum brightness. This duration is based on industry standards to ensure passenger safety.

The other timeframes either do not provide enough time for the lights to reach full charge or exceed the recommendations set by aviation safety standards, which do not require such prolonged exposure. Therefore, this specific duration is crucial to ensuring the lights will illuminate effectively, guiding passengers safely during an emergency evacuation.