Posted by Jon Kirwan on May 18, 2009, 9:42 pm
I've had some last years. But some just a few months, as well. What
seems to be a factor (I keep a log book on light replacements here) is
the location itself. The very worst offender locations are those
located in a ceiling fixture where heat can build up. The very best
locations appears to be those in a vertical desk lamp with a shade on
it, where the lamp is fixtured upright and there is a lot of air that
can circulate around it. Those last a pretty long time. Best is when
the fixture itself is part of a metal structure -- I have some old
lamps that used to be genuine street gas lamps (made of near pure
copper, by the way) which have the old stands, a long tall pole, and
the lamp head at the top. These have been re-purposed by the addition
of wiring down the long pole. The lights do well in these if I keep
the glass windows open (those that used to be used to light the gas
lamps) for circulution.
Well, there you are. You don't have a problem.
Posted by osr on May 19, 2009, 1:41 am
You may find this interesting:
Posted by Jon Kirwan on May 19, 2009, 2:16 am
On Mon, 18 May 2009 18:41:51 -0700 (PDT), email@example.com wrote:
Any particular part of it? They mention, "With careful monitoring of
both sets for lamp failures, total energy usage (electricity, gas,
heating oil, etc.) and overall satisfaction or otherwise, a realistic
set of statistics can then be developed to show exactly what the
outcome of a wholesale ban would achieve." The 'overall satisfaction'
part of it makes such analysis more subjective, but I've been keeping
logs for all the fixtures in the home here, which I've occupied for
more than 7 years now. It started with ALL incandescents and I've
been replacing various locations as the bulbs fail. Sometimes with
CFL, sometimes with incandescent of similar lumens ratings (not
What part did you want to draw my attention towards? It's long.
Posted by Anon on May 21, 2009, 10:16 pm
I have spoken with a few reps from wholesalers, and even a rep from a
manufacturer (not quite a Big 3 but still up there in volume and
reputation), who don't recommend using CFLs in fixtures where the bulb is
oriented with the circuitry at the top, especially warning against the same
orientation in enclosed fixtures. The trapped heat shortens their life
considerably. This rules out many existing fixtures, including ceiling cans
and other ceiling fixtures.
Despite all of the "spin" and indeed gov't regulation, CFLs are not ready
for prime time yet.
Posted by Don Klipstein on May 21, 2009, 10:31 pm
<SNIP to this point>
This overheating when base-up in enclosed fixtures and downlights is a
fairly common problem, but some CFLs are endorsed for use some of these
"heat hellholes" (my words):
Many of the major brands now have CFLs marketed specifically for use in
ceiling fan fixtures. They are not perfect - they only come in 9 watts
(40W incandescent equiv.) so far in my experience, and they have outer
bulbs. CFLs with outer bulbs tend to start dimmer and take longer to warm
The Philips SLS ("triple arch" style "Marathon") of 15-23 watts, only
non-dimmable versions, last time I checked, were specifically rated by
Philips to be suitable in recessed ceiling fixtures. I usually see a few
of these in at least one wattage at Home Depot.
- Don Klipstein (firstname.lastname@example.org)