I'm with Andrew for the paint in the print and scanning rooms, with GTi lamps, and the desk covered in grey vinyl (the biggest and best mouse mat I've ever owned).
Our gallery walls are a swansdown - slightly warmer than white, illuminated by Concord Stadium 4k LED lights. Works well. On occasions we've painted the walls black or dark grey - does give the pictures a real pop, but a pig to bring back to a light shade (three coats of good emulsion), so the make good is more of a hassle.
Must go out to the gallery with the Eye1 pro and a laptop, to take a reading from the lamps.