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Blowing bulbs #199129 02/14/11 01:14 PM
Joined: Feb 2008
Posts: 193
S
schenimann Offline OP
Member
I finished trimming out a new house about 6 weeks ago. Everyody was happy. I got a call from the homeowner today about his bulbs burning out. It is mainly the can lights. They are burning out all over the house. app 40 cans. They are 6in junos. I did purchase the bulbs at lowes. They had the Sylvania 65w, 120 volt floods at $1 each. Good money savings so I thought. The problem would problably be solved with 130 volt bulbs. However, they did change one bulb and the new bulb "exploded" in the room which brings concern to the homewner. They also had 2 incandescent bulbs on porch fixtures go bad. It is a new house, ch panel and breakers. Any ideas would be appreciated.

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Re: Blowing bulbs [Re: schenimann] #199132 02/14/11 01:43 PM
Joined: Jul 2004
Posts: 9,547
G
gfretwell Offline
Member
What is the voltage? When it starts getting up in the 125 range, bulbs go fast.


Greg Fretwell
Re: Blowing bulbs [Re: schenimann] #199139 02/14/11 03:24 PM
Joined: Apr 2002
Posts: 7,220
HotLine1 Offline
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Any dimmers on the can lights?



John
Re: Blowing bulbs [Re: schenimann] #199149 02/14/11 04:57 PM
Joined: Jul 2004
Posts: 783
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LarryC Offline
Member
. .

Vibration also shortens bulb life. Any mosh pits or marching bands practicing in the house?

Overheating the bulb also shortens life. Does the bulb packaging state anything about burn base up or down?

Do the occupants work swing or night shifts? Increased voltage at night can also wreak havoc.

Re: Blowing bulbs [Re: schenimann] #199151 02/14/11 05:40 PM
Joined: Feb 2008
Posts: 193
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schenimann Offline OP
Member
I haven't checked any voltage yet. I got the call today and am trying to get ideas before I troubleshoot.

There are no dimmers and they do live next to the hospital with helicopter traffic. It is however, a solid house with minimal vibration. I will check the voltage. If it is over 120v, should I recommend that he use only 130v bulbs.

Would the increase voltage cause the bulb to explode. The shrapnel was a concern for them.

Re: Blowing bulbs [Re: schenimann] #199152 02/14/11 05:47 PM
Joined: Apr 2002
Posts: 7,220
HotLine1 Offline
Member
Bulb envelope failure may be from severe overvoltage, but IMHO not in your case. BTW, dimmers help bulb life dramatically!

Also, IMHO the old addage of 'ya get what ya pay for' applies to bulbs.



John
Re: Blowing bulbs [Re: schenimann] #199154 02/14/11 06:00 PM
Joined: Mar 2005
Posts: 1,803
Alan Belson Offline
Member
I have heard complaints from friends about 230v 50W GU10 halogens exploding. The challenge was to find all the bits! These were 'quality' replacements for the original chinese bulbs that expired after 2000 odd hours. Could be a bad batch? BTW, low-energy bulbs must be switched on for a minimum of 15 minutes, or their life will the same as a tungsten filament bulb. That's a challenge in some locations [bathroom, wc etc. ] and a halogen fitting would be better.


Wood work but can't!
Re: Blowing bulbs [Re: schenimann] #199155 02/14/11 06:04 PM
Joined: Feb 2008
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schenimann Offline OP
Member
Hotine, you are right about buying the cheaper bulbs. I will probably replace his bulbs or give him some kind of a credit. Lesson learned.

Re: Blowing bulbs [Re: schenimann] #199156 02/14/11 06:10 PM
Joined: Jul 2004
Posts: 9,547
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gfretwell Offline
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You can also have a loose neutral problem that wreaks all sorts of havoc but blown bulbs is one of them. Check both rails to neutral and be suspicious if they are not exactly the same. Try tripping a couple of the breakers on one phase while watching the voltage and see if it changes but go slow, just do one and watch for a while. If you do have a neutral problem the change can be real sudden, blowing up everything on the less loaded phase.


Greg Fretwell
Re: Blowing bulbs [Re: gfretwell] #199163 02/14/11 06:44 PM
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Posts: 8,359
Trumpy Offline
Member
I've heard a theory bandied about in the last few years regarding cheap incandescent lamps and their extremely short life-spans (some I've heard are measured in milli-seconds).
What was being said, was that the reason behind the failure is caused by the glass envelope of the bulb not being evacuated properly and there still being air inside the bulb.
Now, everyone knows that a light-bulb filament needs to be in a pretty good vacuum otherwise it's life is pretty short-lived (we even tried this at Night School).

I don't know how much one can actually read into such a theory, but it does make you sort of wonder.

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