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Halogen Lamps - premature burn out

Discussion in 'Electrics UK' started by Daftlad, 12 Jan 2006.

  1. Daftlad

    Daftlad

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    Hi,

    I moved in to a house about 3 years ago that had been "refurbished" and in the kitchen there are about 8 halogen spots in the ceiling. My problem is that every 4-6 months I am replacing the bulbs.

    The box says these bulbs have a life expectancy of 3000 hours. I reckon I'm getting about 10% of that.

    The bulbs I am buying are 240v 50w with the turn and lock connection.

    I thought that if the power to those lights is governed by a transformer then that may be my problem - anyone got any ideas????

    Thanks
     
  2. ban-all-sheds

    ban-all-sheds

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    Lamp lifetimes are the time by which you can expect half of them to have failed, when not subject to any external influences that shorten their lives.

    All sorts of factors can shorten their life - overheating, vibration, use of dimmers, overvoltage, frequent switching..

    What make of lamps are they - good ones, or cheapos?

    And you are sure they are rated at 240V are you, and not 230V? That alone can almost halve their life...
     
  3. Qedelec

    Qedelec

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    Are you making sure the glass is not soiled with fingerprints or grease, I know this is hard in a kitchen. But because Halogen bulbs run very hot, any ditritis on the glass will turn to carbon very quickly and create a hot spot which causes the lamp to run even hotter. Try regular cleaning and see if it makes any difference.
     
  4. stem

    stem

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    The lamps fed via transformer are of the extra low voltage type (12v not 240V) On the early systems the transformer had to be sized to fit the number of lamps it supplied. if it was too big it burned the lamps out too quickly, too small and the brightnes was reduced. If a lamp (or lamps)failed and were not replaced this could also cause the others to burn out more quickly. More recent transformers are more tolerant.

    However if yours are 240v this would not apply.
     
  5. Qedelec

    Qedelec

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    So why did you post????
     
  6. stem

    stem

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    In his original post Daftlad asked about transformers. No one's answered him yet. So I thought I would. For all I know he could be ripping up floorboards looking for non existant transformers.
     
  7. treacleman

    treacleman

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    6 months at 6 hours a day = approx 1000 hours. worst case scenario.
    GU10 mains halogens have, generally a 1000hr life. that's a reputable brand.
    and that is an AVERAGE life.
    not a guaranteed life.
    either you are unlucky, or using cheap unfused imported lamps.
    Either way, I don't think you have a problem.
    get some low energy GU10's if you want 15,000 hours. For £6 each, you will have a lovely light and peace of mind.
     
  8. Daftlad

    Daftlad

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    Thanks for your reply.

    I have used a variety of replacements from tescos own! to Philips - I have not noticed much of a difference in either.

    The lamps I buy are definitely 240v.

    I guess I should try and see what the fittings are rated at[/quote]
     
  9. Daftlad

    Daftlad

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    Thanks, for the advice, I will try cleaning and keeping fingers off
     
  10. Daftlad

    Daftlad

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    Not sure if they are run off a transformer. I'll have to have a look-see and rip up some boards - Thanks
     
  11. Daftlad

    Daftlad

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    Thanks I'll give the GU 10's a try out. I'm currently paying £3 a lamp for 6 months life so if I get just 18 months from the GU 10 I'll be better off
     
  12. Qedelec

    Qedelec

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    If the lamps you are buying are 240V then please don't waste time and effort taking up floor boards I doubt very much that you will find any transformers
     
  13. ban-all-sheds

    ban-all-sheds

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    GU10s are sealed - it's only the quartz envelope that needs to be kept grease-free, and with GU10 lamps the envelope is behind a piece of glass...

    Then they are not run off a transformer..

    FYI - "GU10" is the format of the lamp. You can get halogen GU10s (what you currently have), compact fluorescent (CFL) GU10s, LED GU10s....
     
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