British/LW gauge illumination

[mongoose]

Before working on the illumination for Ankor Sahders in the night on all British and Luftwaffe gauges, some ?s have come up.
To quote Gecko

"For me there are still some unanswered research questions - what kinds of lighting systems were used, and how bright could you expect different types to be? Which markings were lit? Every word and note? Just selected parts of markings? Is that why many British gauges have both white and green numbers painted on them?"

Anyone have any historical info on BC and NF a/c as well as LW NJ ones??