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Old 19th Apr 2021, 11:20 am   #16
Join Date: Jan 2010
Location: North Somerset, UK.
Posts: 1,816
Default Re: Crompton 60W bulb

Submarines and indeed surface ships do use red lighting at night, in order to preserve night vision.
I suspect that RN vessels use some special and expensive lamps, not something that can be purchased for less than 1 in the local hardware store.
Or standard clear lamps in a red cover.

Modern ships tend to use red fluorescent tubes, or LEDs.
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