Until fairly recently in the RAF, on airfields without permanant lighting we used what were called 'gooseneck' lights. Imagine a metal watering can, but instead of a sprinkler rose on the end of the tube, the tube bends down by say, 30 degrees for a couple of inches. Into that & down the tube goes a large cotton? wick, & the can if filled with parafin. These things burned all night on one filling & were so low tech they couldn't go wrong, even English weather couldn't put them out!
So, a lot of the English WW2 fields would be very basic, runways, a few buildings, no hot water etc, &, probably, limited electricity. So why not put a few scale goosenecks into a diorama? Maybe they could be knocked up from resin?
The real things stood about 1 foot high, maybe ten inches across the long sides of the oval base. Galvanised metal finish or painted yellow.
Usually we only lit them when they were needed, & put them out until the aircraft came back (this was night flying on choppers in the 80's/90's) they were also used as markers for para drops back then on disused airfields around Salisbury plain.
Not what you asked really, but it could make your diorama different!
All the best
Pete