The lighting in the restored St Albans South box uses the original light fittings, seen here in 2018:
View attachment 141771
The shade on the right nearest the camera directs light onto the clock and train register book desk and the further shade on the sink and cooker that were near the door.
The two lights on the centre line of the box light up the levers, diagram and block instruments.
Behind the photographer was a desk with the station announcer's console, lit by a small lamp shaded to shine vertically down.
We assume the lighting was arranged this way to allow the signalman to look out at night and see the tail lamps etc.