Green Lamp Glasses in miners lamps and utility lamps

Thanks to Paul M for the question, here is the answer courtesy of David Barrie at the wand of science

Used in WW2 to reduce glare from lamps used in blackout! There are adverts for these, far fetched as it sounds. I can just imagine the Nazi bomber pilots – “Iz zat a Protector 6 or iz it an SL Mein Herr? “

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