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Vintage Westinghouse F15T8/D from 1959.
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Made in 4th quarter of '59, used but still works fine on a preheat choke. Unlike today's F15T8/Ds, this one is blue-white with a very slight touch of green, and is slightly dimmer. It's merely beautiful! What I like is that most of my fluorescent collection is actually formed of daylight fluorescent tubes, so I can compare all decades from 40s up to nowadays in that color temperature!
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