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Electrical advice - lightbulb keeps turning off of its own accord!


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Old 11-01-2011, 00:05
Sunshine&Solace
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Just wondered if anyone with any electrical knowledge on here could advise me about something.

We have four halogen bulbs in our bathroom and recently one of them has taken to going off about five minutes after it is turned on at the light switch. The rest of the bulbs (controlled by the same light switch) remain on until they are turned off at the switch, but this random bulb just turns itself off.

The bulb also turns off if I plug something into the electrical socket that is in the hall just outside the bathroom.

Does anyone have any ideas what is causing this?

Thanks in advance.
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Old 11-01-2011, 00:17
wmoore
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I no expert, but you may just have a slowly dying halogen bulb, just take it out and replace it with a new one. The socket outside shouldn't effect the bulb as they are on different circuits. maybe it's just a coincidence that it is happening.
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Old 11-01-2011, 00:19
Sunshine&Solace
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Thanks for that but I've tried replacing the bulb and it didn't make any difference so I don't think it's that.

Interesting to know that the socket shouldn't affect it, that's a really bizarre coincidence then!
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Old 11-01-2011, 00:25
RobinOfLoxley
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Swap two of the bulbs over if you don't have a spare.

It will give you an idea if it is the bulb or the fitting / wiring.

Does sound strange though.

=============
I have two new ish bathroom lights (upstairs and downstairs), different manufacturers/design but both large Edison screw fittings and fitted with low energy Philips Spiralux bulbs..

Both worked for some months, then upstairs packed up. It would then only stay on while I was holding the bulb. Normal tungsten filament bulb is fine.
Other replacement low energy bulbs are not.

10 days later, same thing happened downstairs. Go figure.

I am baffled and annoyed because I am a qualified electrician and cannot for the life of me see why these bloody bulbs are not making good contact. I have reterminated, cleaned contacts and checked everything.
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Old 11-01-2011, 00:36
Sunshine&Solace
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Swap two of the bulbs over if you don't have a spare.

It will give you an idea if it is the bulb or the fitting / wiring.

Does sound strange though.

=============
I have two new ish bathroom lights (upstairs and downstairs), different manufacturers/design but both large Edison screw fittings and fitted with low energy Philips Spiralux bulbs..

Both worked for some months, then upstairs packed up. It would then only stay on while I was holding the bulb. Normal tungsten filament bulb is fine.
Other replacement low energy bulbs are not.

10 days later, same thing happened downstairs. Go figure.

I am baffled and annoyed because I am a qualified electrician and cannot for the life of me see why these bloody bulbs are not making good contact. I have reterminated, cleaned contacts and checked everything.
Sorry to hear you are having electrical problems as well Robin - must be even more annoying if you are an electrician yourself.
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Old 11-01-2011, 06:49
QTC13
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Do the lights have covers on?

I ask because I have a light/shaver unit installed above the mirror in my bathroom. If the diffuser light cover is removed the light goes out. I've noticed a few times that when the light is on, as it heats up it causes the diffuser cover to expand and move out of the correct position. Once I tap the cover back into place the light comes back on. Worth a look?
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Old 11-01-2011, 07:19
paulyoung666
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are they low voltage transformed halogens or 240v ones ?
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Old 11-01-2011, 19:48
Sunshine&Solace
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Do the lights have covers on?

I ask because I have a light/shaver unit installed above the mirror in my bathroom. If the diffuser light cover is removed the light goes out. I've noticed a few times that when the light is on, as it heats up it causes the diffuser cover to expand and move out of the correct position. Once I tap the cover back into place the light comes back on. Worth a look?
Thanks for that but they don't have covers.

are they low voltage transformed halogens or 240v ones ?
They are the 240v ones.
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Old 12-01-2011, 00:15
MARTYM8
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I only have 3 of the 4 halogen lights working in my bathroom (changing the bulb doesn't make any difference()and don't really see it as a big problem - do you really need the 4th one anyway (you probably only spend 10 mins a day in the bathroom)?

Surely there are other things we could be stressing about - even though I recognise its annoying!
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Old 12-01-2011, 07:11
Sunshine&Solace
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I only have 3 of the 4 halogen lights working in my bathroom (changing the bulb doesn't make any difference()and don't really see it as a big problem - do you really need the 4th one anyway (you probably only spend 10 mins a day in the bathroom)?

Surely there are other things we could be stressing about - even though I recognise its annoying!


Don't know where you go the idea I am stressing about it lol. I am just interested in why it is happening.
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Old 12-01-2011, 13:18
bmillam
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Swap two of the bulbs over if you don't have a spare.

It will give you an idea if it is the bulb or the fitting / wiring.

Does sound strange though.

=============
I have two new ish bathroom lights (upstairs and downstairs), different manufacturers/design but both large Edison screw fittings and fitted with low energy Philips Spiralux bulbs..

Both worked for some months, then upstairs packed up. It would then only stay on while I was holding the bulb. Normal tungsten filament bulb is fine.
Other replacement low energy bulbs are not.

10 days later, same thing happened downstairs. Go figure.

I am baffled and annoyed because I am a qualified electrician and cannot for the life of me see why these bloody bulbs are not making good contact. I have reterminated, cleaned contacts and checked everything.
have you tried changing the bayonet fitting, the sprung loaded pins might not be making contact properly.
also low energy bulbs are heavier than normal filament bulbs. could you have a dodgy piece of wire or contact in the rose.
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Old 12-01-2011, 13:24
bmillam
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The bulb also turns off if I plug something into the electrical socket that is in the hall just outside the bathroom.

Does anyone have any ideas what is causing this?

Thanks in advance.
this sounds like that particular lamp does not have the same common return the other lamps have.
if you are an electrician, remove the electrical socket that is in the hall so you can see the connections in its back. you might find one of the neutral wires is loose.
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Old 12-01-2011, 14:11
RobinOfLoxley
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Thanks bmillam, for your advice to me. Mine are both ES screw fittings.
Have tried 'barely tight', tight' and 'very tight' and a variety of bulbs.

I have just left tungsten filaments now which work regardless of tightness.
It just bugged me at the time. I am chalking it down to Chinese vs European tolerances.
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Old 12-01-2011, 14:20
bmillam
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Thanks bmillam, for your advice to me. Mine are both ES screw fittings.
Have tried 'barely tight', tight' and 'very tight' and a variety of bulbs.

I have just left tungsten filaments now which work regardless of tightness.
It just bugged me at the time. I am chalking it down to Chinese vs European tolerances.
if it is a pendant type I would still check the wire and rose connections due to the weight difference.
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Old 12-01-2011, 14:58
Tech Lover
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First, I will check if the light bulb is too loose.
If no improvement on the situation, then I will exchange two light bulbs to find out whether the problem comes from the light bulb or the socket.
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Old 12-01-2011, 15:04
camer
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Just wondered if anyone with any electrical knowledge on here could advise me about something.

We have four halogen bulbs in our bathroom and recently one of them has taken to going off about five minutes after it is turned on at the light switch. The rest of the bulbs (controlled by the same light switch) remain on until they are turned off at the switch, but this random bulb just turns itself off.

The bulb also turns off if I plug something into the electrical socket that is in the hall just outside the bathroom.

Does anyone have any ideas what is causing this?

Thanks in advance.
The most likely cause would be the lampholder itself as they burn out very easily, I replaced dozens of lampholders last year due to the same problem, are your halogen lamps open to the air or do they have a glass cover over them?
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Old 12-01-2011, 15:24
RobinOfLoxley
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Please, no more replies to me. This is Sunshine & Solace's thread. I only mentioned my probs in passing.
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Old 12-01-2011, 16:00
Stewie_C
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The fittings themselves do go - I've changed a fair few GU10 fittings of late. If it's not the lamp then the fitting is probably the fault, but you might have poor connections between the junction box that's likely to be near to the fitting. But my money would be on the fitting.

It might be related to the nearby socket if someone has decided to wire the lights from it. The bathroom lights should NOT be wired from the ring main unless they have a switched fused isolator with the correct fuse, and in any case that's (IMHO) a bodge job. They should be wired from the lighting circuit that serves the rest of that floor of the property. I'd also point out that any work done in kitchens and bathrooms cannot be done by DIY'ers under part P of the building regs. All work in these areas needs to be signed off by somebody competent to do that. Changing like for like is OK but any other work has to be signed off by a pro.
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