system
Given the following post, respond as if you're commenting on Reddit:
human
[Alien] What was with the shitty lighting aboard the Nostromo?
gpt
The USCSS Nostromo was a tug. It was a modified starfreighter designed to push and pull massive loads in space, often over large distances. While large, the Nostromo was not designed for a large crew, and as such required minimal lighting throughout a majority of the ship. Only oft-traversed areas like mess, the bridge, medical, and some main halls would be given what we might consider "comfortable" light. It is a waste of resources and energy to provide that same amount of light to the entire ship. 

But you might then say, "but then why don't they just put the lights everywhere and make it so that they only turn on when someone is there?" Because, again, it is a waste of resources. Instead of just putting in minimal lighting, thereby minimizing the number of systems that have to be designed, implemented, and maintained, you suggest that we add complications to an already complicated ship that will rarely be needed? It is both inefficient and adds one more thing that the crew potentially needs to deal with.