On Thu, 18 Oct 2012 18:24:55 -0500, Michael Dobony
No, bad connection will cause the fillament to fail early due to
flickering (which you may not even see) Any induction in the circuit
causes high voltage but the induction in the coiled tungsten filament
is negligible so high voltage is not the explanation (or at least not
the major influence) Flicker causes higher peak current draw, and
magnetic vibration in the coiled filament.
Is the threaded part of the base made of brass with the wire from the
bulb soldered? Or is the threaded part made from aluminum and the wire
is just bent over the aluminum? We had a bunch of the latter, and they
didn't last at all.
What does the bottom connection look like? It should have the lamp wire
soldered there and be quite a large contact area for the socket. Might
be clean and bright, but no solder.
On Thu, 18 Oct 2012 21:55:38 -0700, Paul Drahn wrote:
I haven't had a problem with these fixtures for years. Now the bulbs are
suddenly burning out quickly in all 4 fixtures. The 2 have been in there a
week and doing ok. Just got to the other 2 today, bulbs from another box.
Standard household bulbs are made on high-speed machines (several machines
running in parallel porducing hundreds of bulbs/minute), so if something
drifts out of spec, a lot of bad product gets made rapidly. Every bulb is
lighted and tested for operation, gas fill and other things that might
affect performance, but a few bad bulbs always get out and usually they're
in the same package or box. It sounds like the OP has gotten some bad
bulbs. Call Sylvania and ask for replacements. Usually, the bulbs will be
replaced for free along with a couple of extra for your trouble. I worked
for a lamp company in the complaint dept. for several years and a few bad
bulbs were a common complaint and quickly handled; but you do have to write,
e-mail or call. You can always find someone with stories about bad bulbs,
but the number of "bad" bulbs from the major manufacturers, especially if
the bulb is Energy Star labeled, is a fraction of a percent. You can see
how bulbs are made here: http://www.youtube.com/watch?v=GH2nRx9bY6k
Vibration will kill them, we always lost bulbs after the kids had friends over
Another thing that will shorten the life is screwing them in too far. I think
that it damages the rather fragile seal at the base. Contact plus 1/8 turn is
all you need.
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