What unique action is required for Photo-Luminescent Lighting to work effectively?

For Photo-Luminescent Lighting to function effectively, it indeed requires a specific action to charge the system. The lighting absorbs ambient light and then emits it in low-light conditions, making it essential for the cabin lights to be turned off or dimmed to allow the photo-luminescent materials to adequately charge. This process ensures that the lighting is bright enough for visibility during emergencies or when navigating the cabin in darkness.

The other options do not represent the necessary condition for the photo-luminescent system to operate. Activation by passengers or monitoring by the Flight Deck Crew is not required for this type of lighting to function. Additionally, while installation is required, it does not affect the effective operation during the flight itself. The critical factor is that the lights must be charged appropriately to be visible when needed.