Lamps (source of lights)
There are some lamps, ok. But they don't light anything, being emissive only. I understand that actual light will burn away some of precious FPS but I am able to invest in a better GPU if I can see anything on my dark airship. And if it has a pleasant look, it would be a blast and people will love you even more. Just imagine - hanging lamp that actually lights up.
P.S. Final solution will vary from the attached graphics - it is added for illustrative purposes only.