We use many of the (currently popular) screw in fluorescent
We often get 'em at Home Depot, and they have a seven year
None have lasted more than two years, and, to date, we have
received on the order of two dozen as warrantee
replacements. The manufacturer does not even ask that we
return the failed bulbs.
More than a few have failed in less than a month, and since
the first of those, I mark 'em with the date of installation
and the date of failure.
When I first noticed the very short MTBF, I called the
manufacturer's tech folks. The first thing they asked was
for a description of the fixtures that hold them. They are
(mostly) ceiling cans of the sort that are closed on the
top, and open on the bottom. When I provided that answer, I
was told that such an installation should not be affecting
the length of life of the bulb.
So, I have become curious...
How long do these things last for others out there?
Heat does kill the electronics faster. I have about 60 HD cfls going
for 2 years, one that blew was in an enclosed ceiling light. Ive only
had 2 failures. Your fixture is holding the heat, but you have a 7 yr
warranty. Do you just go back to HD or do you have to mail them in.
I should have mentioned that last issue...
The first time or two that I accumulated a half dozen, I
just took them with me the next time I went to HD. I brought
them to the returns desk, and two minutes later left with a
stack of new bulbs.
Then, when I went to do that again, a manager got involved
and made a very big deal of it telling me that I had to
contact the manufacturer.
I did that, and then replaced the bulbs with no hassle.
IIRC, they asked on the first occasion that I send them
back, but after that they just asked me how many had failed.
All the best,
I installed a whole bunch (~25) a couple of years ago
and only one unit has failed thus far.
I do seem to have bad luck with flourescent tubes; they
always seem to fail prematurely. And, yes, I always
replace both tubes in a two-tube fitting at the same
time. Usually, I replace the ballast too.
It's a bummer since replacement and disposal of the
dead bodies is a significant hassle.
| Malcolm Hoar "The more I practice, the luckier I get". |
On Feb 24, 7:24 pm, firstname.lastname@example.org (Malcolm Hoar) wrote:
I rarely replace both tubes, and in fact just take from a stack of 40
or 50 old used tubes from a school renovation project.
occasionally one of the used tubes will be bad, but infrequently.
Also; only occasionally replace a ballast (again have stack of 'used'
spares) and only in very old decrepit/use/second-hand fixtures that
we 'fix-up' to use over work benches, garage etc. Have never replaced
ballast in any of the new household/kitchen fixtures. So far have
never needed to replace an 'electronic' ballast, got a couple of them
spare as well!
We are 115 volt 60 hertz AC here.
We've been in this house for 6 years, also about when we started using
these compact flourescent bulbs, and none have died yet. They're also
all Phillips or Sylvania (I don't think we have any GE bulbs). One
older Phillips CFL has to be 7 years old and is lit every night for
more than 5 hours at a time. We don't use these in short duration
on/off situations, like bathrooms or the front porch, and we don't
have flaky power in the house. No complaints.
Ive done some failure analysis * on some of these and found its the
electronics that usually fails. I dont doubt that they would work for
7 years of normal use if the elctronics wasnt being operated at its
* I cracked them open to see what smoked.
On Fri, 27 Mar 2009 04:29:05 -0700 (PDT),
I'm the OP...
Your comment, together with others here have really helped:
We live in a rural area, and heat geothermally.
Those two aspects of our situation may seem unrelated, but
they are indirectly related.
Our electrical supply is (how to put this delicately...)
something less than stable. There are all sorts of voltage
On top of that, our well pump is about the size of a
locomotive, and when it kicks in, there is a very obvious
My strong suspicion is that these fluctuations are the cause
of the bulbs' shortened life...
All the best,
I've been using the GE cfl's sold by WalMart.
The light color is excellent. ( none of that "corpse blue" lighting )
Haven't had a failure yet.
I think that overheating would cause premature failure.
Problem comes up with fixtures that cover the lamp
with a complete glass ball. ( as in bathroom fixtures )
So you're saying that CF's are MORE sickened by heat than
(I mean, look at fixtures for incandescent bulbs, like
in a ceiling light in eg a bathroom -- enclosed, only
wee holes for air flow, must get PRETTY DARN HOT in there!
Incandescent bulbs are used in self cleaning ovens which get up to
about 900 degrees Fahrenheit or 500 degrees Celsius in the cleaning
I don't understand why they make gourmet cat foods. I have
known many cats in my life and none of them were gourmets.
They were all gourmands!
I kept reading this thread-title (before actually getting
into the thread itself) as being about some small screw
inside (office-ceiling?) flourescent-fixtures, giving
some kind of problem.
(Well, my brain-type gravitated me towards an engineering
major -- you know, pencils in pocket (in a POCKET PROTECTOR,
for god's sake! (Ditto for today)), etc, and of course
take spoken/written words LITTERALLY -- assuming that
what's written or said was carefully constructed
so that I could do just that.)
(Heck, I was married (one year only) to a print-reporter
then tv, etc, all of whose friends were also English-majored
types -- NONE of whom could tolerate the thought of someone
with pencils in a shirt pocket, ...)
(Current wife (of ~30 yrs) says sentences that mean one thing
if taken literally, but expects you to be able to figure
out what she really means!)
Anyway, the hyphen would certainly help.
For possible thread somewhere: why is it that lawyers rarely
if ever use hyphens in contracts, etc?
my bulbs are in enclosed ceiling fixtures for 4 years now and have
repleced none of them they all work as well as the first day they were
installed, i wonder if you might have a voltage problem that could be
shorting the life of your bulbs. just a thought.
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