British Standard Aerospace Series : Specification for Lighting for aircraft indicators using integral filament lamps
2 Definition
3 Supply voltage
4 Colour of light source
5 Measurements
6 Luminance
7 Warning flags
8 Stray light
9 Markings to background contrast ratio by daylight
10 Reliability
11 Safety—electrical connections
BS 2G 191:1988 history
0000 BS 2G 191:1988(2000)
1988BS 2G 191:1988 Specification for lighting for aircraft indicators using integral filament lamps