Final answer:
Photoluminescent strips should be charged for 12 hours under adequate lighting or at half-power for 24 hours before the first flight to ensure sufficient brightness.
Step-by-step explanation:
The duration required to charge photoluminescent strips for bright mode is contingent on the available lighting conditions prior to the first flight of the day. An effective charging scenario would either be these strips being charged under adequate lighting for 12 hours or operating at half-power (dimmed mode) for 24 hours. Both approaches allow for sufficient energy absorption by the photoluminescent material to emit a bright light when necessary, which is especially critical in aviation for visibility and safety during emergency situations.