Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!van-bc!ubc-cs!uw-beaver!fluke!strong From: strong@tc.fluke.COM (Norm Strong) Newsgroups: sci.electronics Subject: Re: Halogen news (Re: Do Halogen lamps need ballasts?) Message-ID: <1991Jan17.160358.8553@tc.fluke.COM> Date: 17 Jan 91 16:03:58 GMT References: <16120020@col.hp.com> <10040@pasteur.Berkeley.EDU> Organization: John Fluke Mfg. Co., Inc., Everett, WA Lines: 23 In article <10040@pasteur.Berkeley.EDU> charless@cory.Berkeley.EDU writes: }In article <16120020@col.hp.com> dunphy@col.hp.com (Dan Dunphy) writes: }>>/ col:sci.electronics / schuster@cup.portal.com (Michael Alan Schuster) / 4:41 pm Nov 29, 1990 / }>> }>>What's the principle behind the "krypton" flashlight bulbs being sold }>>now, and market as "70% brighter" than the standard type? }>>---------- }>I suspect they use a principle similar to halogen. I just }>tried my first. They are a lot brighter. } }I don't know if Krypton bulbs use a halogen cycle too, but the idea of the }krypton is that it is a heavier gas than the usual fill gas, and so retards }the evaporation of tungsten more, and I think has lower thermal conductivity. }You can take the benifits of this as longer life or higher efficiency, depending }on what temperature you design the filament to operate at. Xenon is even heavier, and has the additional advantage of being a lot cheaper. So where does that leave your argument? -- Norm Strong (strong@tc.fluke.com) 2528 31st S. Seattle WA 98144