Is "brownout" a common or standard term in the industry? First time I see it.
replies(8):
The OED reports that the disrupted-electrical supply sense of blackout was first used in 1934; the air-defence one (no light) in 1935. However, the OG use seems to be in the theatre, where the lights are shut off during set changes (1913, probably earlier).
Brownout does seem to be a WWII-era term, but more related to conservation/shortages than air defence.