Yeah that had me looking as well. It would make sense to not have it too bright and blinding through the night. Do you know what the blue lights on the left side is?
Basically in the Ligier you have three displays, the classic steering wheel which is from PI like all the on-board electronic systems (power distribution), then you have a motec data logger (Oak have been using it for ages and I don't see why they would stop) which also have a display on the left in order to monitor vehicle vital parts (temperature, pressure,...) and also for the alarms.
On the Morgan you got fix blue light for the last 8-9 liters (basically only for Le Mans) and a flashing blue one for the last 5 liters. These two alarms have different conditions which explains why it sometimes turn off.
The last display on top left is for the marshalling system.
For deggis, yeah all those displays and leds have a night mode that reduce its brightness otherwise it is really disturbing the driver