Aircraft i`ve operated, DHC8-300, this had LED type floor lights. Avro RJ. Photo luminescent strips. NO charge needed. used the emergency lights to operate the strips. (floor and edge of seats). Strips were replaced on a time expired system by engineers to ensure they met the suitable performance. current aircraft EMB170/190. Modern new aircraft with modern system. Requires a charge of only 15 mins in normal light levels. Modern materials are very good. They have a half life of about 8 years and are not effected by extreme heat or cold or give out electromagnetic of radiated frequency interference like the older strips found on older aircraft. I guess its all about knowing what you are working with and its limitations and having a full understanding of all equipment.