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Lamps From Joe Maurath
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From Left to Right starting in the back: NOS Westie "Eye-Saving" lamp with its original sleeve, it's 150W | 175W Westinghouse cleartop LifeGuard lamp with very low hours (date code is 5 on one side of the W logo, 4 on the other) | Westinghouse 100W cleartop lifeguard lamp with very black arctube (date code is 3 on both sides of W logo) | Sylvania 100W cleartop with very black arc tube (date code "64") | Sylvania 100W ET23.5 with semi-black arc tube (date code is "MR 4-94" which is stamped on a metal tab on the stem) | NOS 200W GE mogul base lamp (i have two). I think these are rare... | Sylvania 400W cleartop with non-original sleeve (though i believe it's period-correct). The date on this one is "01" i believe. I've tested all of them except for the 400 and 175 watt lamps and they all work.
Thanks to anyone who can date any of these lamps! ^_^
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Westinghouse 100W cleartop lifeguard lamp March 1973
Sylvania 100W cleartop April 1975
Sylvania 100W ET23.5 has to be April 1994 but that's not usually a date code Sylvania used either in GTE or Osram days...but 1993-1994 was when it was carried over from GTE to Osram
NOS 200W GE mogul base lamp (i have two). I think these are rare
Sylvania 400W cleartop I may need more information on this one but I think January 1971
Even testing 400 watt is possible on 100 watt ballast but will be dim....just make sure for both above to use only HX ballast, not CWA....
@ Vince; thanks!
@ Joe; lol.