I have made several trips to US ARTCC centers and they had very dim lighting. I was told the lighting, carpet and wall colors where all decided on by the (PATCO) union contract with the FAA.
This week I was watching a BBC documentary and the British air route control room (NATS) was brighter than a normal office.
What is the justification between the two lighting preferences.
Dimly lit ARTCC room, even the display and control area use dark trim.
Brightly lit British NATS room, note the bright display and control area.