Context: In a movie theater, steps in the aisles are usually marked with a row of small lights for convenience and safety, when the film has started and the other lights are off. Traditionally made up of small low wattage, low voltage lamps in a track or translucent tube, these are rapidly being replaced with LED based versions.

Question: What do steps in move theater aisles have for safety markings?
Answer: small lights

Question: What are the low wattage lamps being replaced with in movie theaters?
Answer: LED based versions

Question: What kind of tube are the movie theaters lights enclosed in?
Answer: translucent tube