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Old 04-22-2009, 06:24 AM   #16
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Chronic lightbulb failures in can lights


Quote:
Originally Posted by kbsparky View Post
....... More likely worn out from years of service
I get the impression that the house is new (≤ one year)
Quote:
Originally Posted by TexasEd View Post
Post#10
....... I am using what the builder installed for the size of the bulbs, but they could have installed the wrong size. I have been using BR30 floods. I'll remove the bulbs to see if I can find a model number on the cans to look up the recommended bulbs.

I will also check to see if all the cans are the same model. (I think it would be bad to assume they were)
When Texas gets back to us hopefully he will have removed the trim and looked up into the can to see whether or not it is the same can as the four that do not have a problem. AT the same time he can remove the bulbs and with a strong flashlight inspect the lamp sockets for discoloration or contact erosion.

My hypothesis is that the builder, either by accident, or on purpose installed IC cans (which have tighter restrictions on wattage and bulb type) at those two locations.

Another possibility is if the Trim is different on the two 'problem' cans as compared to the four 'good' cans. And finally there is the chance that the builder just used cans with cheapo sockets that have failed.

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Old 04-22-2009, 10:39 AM   #17
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Chronic lightbulb failures in can lights


Had a buddy who is an electrician out yesterday and he thinks there might be bad bases in the cans. His theory is that there might be a bad connection somewhere causing shunting. He is going to replace the two bases in those two fixtures.

I am embarrassed to say that the lights that were burned out were actually incandescent. I am sure we had fluorescent in them at one time and they must have been replaced. I know for a fact that we have blown at least one, probably two fluorescent lights out of them.

The fixtures did appear to be IC fixtures. I have not compared them to the other fixtures.
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Old 04-22-2009, 10:41 AM   #18
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Chronic lightbulb failures in can lights


The house was built in 2006. New neighborhood with buried utilities. The transformer is one house over.

The bulbs that have burned out were within the specs of the cans. 65W BR30
I will replace them with CFL bulbs again once we have the new bases/sockets.

We also have poltergeist in the electrical system where bulbs start humming and we can pick up electrical noise on the baby monitor at the same time. So my friend left his meter on a circuit to check for over voltage over a period of time.

Could the poltergeist in one part of the house be caused shunting in another part of the house?

Last edited by TexasEd; 04-22-2009 at 10:50 AM.
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Old 04-24-2009, 01:47 PM   #19
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Chronic lightbulb failures in can lights


Voltage checked out at a max of 124 over 12 hours.

Going with the theory that we have bad bases and going to replace them.
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Old 04-24-2009, 01:57 PM   #20
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Chronic lightbulb failures in can lights


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We also have poltergeist in the electrical system where bulbs start humming and we can pick up electrical noise on the baby monitor at the same time.
Can you put the electrical noise, and the humming, on YouTube? I'd like to hear that.
How does your friend define "shunting"?

124v into 120v incand. bulbs should give you ~60% of normal lifetime.
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Old 04-24-2009, 02:28 PM   #21
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Chronic lightbulb failures in can lights


The lights flickering and the baby monitor humming has not happened since those bulbs burned out.

My interpretation of how he defines shunting as when the circuit heats up and the base expands the area of conductivity between two pieces of metal in the circuit becomes too small and you start drawing higher amperage across this resistance and you have even more heat buildup.
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Old 04-28-2009, 12:46 PM   #22
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Chronic lightbulb failures in can lights


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.....Another possibility is if the Trim is different on the two 'problem' cans as compared to the four 'good' cans.....
In response to Ed's 'Lightbulb Failures' I queried Halo (Cooper Lighting) with the symptoms and received an e-mail in reply that asked these questions:
Quote:
Questions from e-mail on troubleshooting
-What is the model number of the trim?
-What is the wattage and type of bulb?
-How old are the fixtures?
I think it is significant that the first question from Halo was on the trim rather than the wattage or type of bulb. The Trim type inhibits the airflow around the bulb. The Halo chart shows the limits on lamp wattage for the different types types of trim.
http://www.cooperlighting.com/specfi...RICT_RICAT.pdf

Trims come in all varieties e.g.
  • Open Trims
  • Baffles
  • Wall Washers
  • Lenses
  • Eyeballs
  • Gimbals
The Can may give a lamp style and wattage limit, but the actual limit is lowered by the trim.

Ed, Are the trims on all six cans the same?
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Old 04-28-2009, 01:33 PM   #23
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Chronic lightbulb failures in can lights


Yes, the trim is all the same and they are what you would expect for a flood application. A small bezel ring around the outside. No eye-ball or fancy trim.

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