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Old 26th May 2021, 1:42 am   #53
majoconz
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Join Date: Jan 2008
Location: Ashhurst, Manawatu, New Zealand
Posts: 570
Default Re: Crompton 60W bulb

Quote:
Submarines and indeed surface ships do use red lighting at night, in order to preserve night vision.
...and on our minesweeper way back in the 60'/70's when I was in the RNVR.
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