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Old 10-29-2010, 08:33 AM   #1
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Compact Florescent Burn Out Coincidence


I've been in this house for about 4 years and put CF's into just about all the fixtures at that time. Until about 4 days ago I can barely remember a single CF bulb burning out in the past 4 years. That makes sense to me, as a CF is rated at 10,000 hours and at 4 hours per day that would be about 6 years. (though I know from how much I leave a few bulbs on that they can last much longer than that)

4 days ago a lamp with a CF burns out. I replace it with a brand new one, that one burns out after being on for a couple seconds.

Then 2 days ago another lamp burns out.

A couple days ago I upgraded a bulb to a 150w CF, brand new, now today I find that one burned out. The new bulbs were both different brands.

So in 4 days I have lost 4 CF bulbs, 2 of them brand new. It seems like it has to be a coincidence but seems very weird to lose so many within just a few days.

Anyone else have this bad of luck with CF bulbs? They are not on rebate that often anymore from what I have seen and I think the 150W I just bought was about $4. I can't even imagine what kind of problem would cause these to burn out.

Jamie

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Old 10-29-2010, 12:27 PM   #2
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Compact Florescent Burn Out Coincidence


Socket connection not making good contact? Perhaps there is arcing and/or voltage drop due to intermittent contact. Assuming yours to be like mine, I would be looking at the little tab in the bottom of the socket base. Perhaps you can pull it up a bit to restore the spring force it applies to the lamp base.

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Old 10-29-2010, 04:56 PM   #3
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Compact Florescent Burn Out Coincidence


But there are two fixtures burning out bulbs, right? Odds are they wouldn't both fail at the same time. Do you have a way to check the voltage in the circuit? It may be high.
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Old 11-03-2010, 07:08 AM   #4
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Compact Florescent Burn Out Coincidence


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Originally Posted by Lurlene View Post
But there are two fixtures burning out bulbs, right? Odds are they wouldn't both fail at the same time. Do you have a way to check the voltage in the circuit? It may be high.
HI;

Yes, 2 different fixtures. 2 different circuits. Voltage was normal at time of testing.

I guess it was just bad luck that I went though so many bulbs in a row, I've not had another problem anywhere else.

Thanks
Jamie
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Old 11-03-2010, 06:55 PM   #5
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Compact Florescent Burn Out Coincidence


Do you have any incandescent lamps in use? Do any of them flicker? Is the CFL fixture in quesiton a screw in fixture? Put an incandescent lamp in the socket that seems to be giving you trouble. See if you notice flickering or in particular excessive brightness.

An incandescent lamp will reveal some kinds of voltage problems more conveniently than standing there watching for a voltmeter needle to twitch.
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Old 11-05-2010, 08:02 AM   #6
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Compact Florescent Burn Out Coincidence


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Originally Posted by AllanJ View Post
Do you have any incandescent lamps in use? Do any of them flicker? Is the CFL fixture in quesiton a screw in fixture? Put an incandescent lamp in the socket that seems to be giving you trouble. See if you notice flickering or in particular excessive brightness.

An incandescent lamp will reveal some kinds of voltage problems more conveniently than standing there watching for a voltmeter needle to twitch.
I do have 2 incandescent spot lights installed above the fireplace in the same room. I also have them in a couple other spots in the house and have not noticed any flickering on any of them. I even seem to see very little flicker when high inrush devices start, i.e. motors.

I'll throw a incandescent back into one of the fixtures and see if I notice anything in the fixture in question. Yes they are all screw in style.

I know my service neutral is good, I put in the cable from the panel to the meter pan myself. I just inspected the mast head last month when I was painting and it was in good shape.

Thanks
Jamie

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