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- Path: sparky!uunet!ogicse!uwm.edu!rpi!crdgw1!rdsunx.crd.ge.com!rumsey!kassover
- From: kassover@rumsey.crd.ge.com (David Kassover)
- Newsgroups: rec.photo
- Subject: Re: Lamp intensity vs. lifetime
- Message-ID: <1992Nov22.053755.6593@crd.ge.com>
- Date: 22 Nov 92 05:37:55 GMT
- Article-I.D.: crd.1992Nov22.053755.6593
- References: <1992Nov18.172117.21297@Happy-Man.com> <MAS.92Nov18103752@mipl8.jpl.nasa.gov> <By12xz.4nz@javelin.sim.es.com>
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- In article <By12xz.4nz@javelin.sim.es.com> rspeirs@javelin.sim.es.com (Ron Speirs) writes:
- >From what I have read, I don't think DC would result in greater lamp life.
- >To quote from Sylvania Miniature Lighting Products Handbook, page 11:
- >
- >"Evaporation and Notching. During its normal operating life as an incandescent
- > element, the tungsten filament steadily boils off tungsten atoms at a rate
- > strongly dependent upon the temperature.
-
- I believe that several kinds of photofloods actually have carbon
- filaments. dunno if they behave the same way as tungsten.
-
- >
- >Let's not forget that Edison favored DC power transmission, and the genius
- >behind AC transmission (and the ability to transform voltage up or down)
- >was Nikola Tesla. If Edison had had his way, we would have needed a small
- >generating station in every neighborhood.
-
- If I remember correctly (and I'm sure someone here will be
- willing to correct me), Tesla's problem was that he favored beam
- power transmission (look ma, no wires), and this was just too
- close to black magic to be accepted. The AC/DC disagreement was
- between Edison and Steinmetz, I think...
-
-
-
- --
- David Kassover "Proper technique helps protect you against
- uupsi!khazad!kassover sharp weapons and dull judges."
- kassover@aule-tek.com F. Collins
- kassover@ra.crd.ge.com
-