I'd like some too.
Now THAT said, many years ago the DuroTest salesman in Columbia, SC told me that DuroTest made F14T12 Vitalite POWER TWIST bulbs ( maybe 15 watt also) only as a sales promotion for their sales people. Now wouldn't you all love to find some of those
?
And there's more Sylvania made F15T8 "Vitalites" being sold by the same person. I swear they don't
match my old Duro Test made Vitalites but Sylvania's Design 50 !! They were very close to the Phillips Colortone 50 and the GE Chroma 50 lamps I have..... but at that price it's still a good deal.