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Another possible problem with CFL's

Discussion in 'Hobby Electronics' started by kreed, Jul 4, 2007.

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  1. kreed

    kreed Guest

    Was at a friends place, he had changed some of his incandescants to
    CFL's about 6 years back, and a couple of them had failed. Opened the
    fixture and found that parts of the white plastic internals almost
    crumbling away when touched, but only where they would have been
    exposed directly to the light. In another place a red coloured wire
    crimp (similar to those automotive 3 way crimp blocks) and 2 white
    cable ties had fallen to bits.

    An identical fixture that had been left with the original incandescant
    was fine.

    Im starting to think these CFL's might not be very friendly to non-UV
    stabilised plastics ?
     
  2. Phil Allison

    Phil Allison Guest

    "kreed"
    ** Good info there.

    I have seen a few examples where bi-metal fluoro starters had basically
    disintegrated due to high level UV light exposure right next to the tube.
    Obviously, most starters and tube end fittings are made with UV stabilised
    plastic.

    But there has never been a need to worry about the plastic used for ES or BC
    lamps - until CFLs came along.

    Sods.



    ........ Phil
     
  3. You've obviously never worked on fluorescent tube type lights.

    Dorfus
     
  4. kreed

    kreed Guest

    I have, and have seen this type of deterioration (including milky
    coloured plastics turning brown) many times with Non-UV plastics used
    near standard fluorescents.

    The point that is being made here is that retrofitting incandescent
    lamp fittings with CFL (that don't need, and might not have UV
    stabilised plastics) could be risky, and these plastics now detiorate
    due to the UV.

    This is a potential safety hazard too, as In the case of some light
    fittings where plastic threaded knobs or plastic clips are used to
    secure glass domes/diffusers in place, if these plastics fail and the
    glass drops from the fitting, it could hit someone cause serious
    injury as well as scattering broken glass everywhere.

    Another possibility is of terminal blocks, light sockets, maybe even
    some insulation types on internal wires perishing, leading to risk of
    short circuits or electric shock to anyone changing bulbs, cleaning
    fittings etc.
     
  5. The point I'm making is that this already occurs in standard fluorescent
    tube fittings so it's nothing new. Tombstones and starters crumble at
    the slightest touch, wiring insulation cracks. It's usually far more
    economical to replace a complete light fitting then to repair it.

    Dorfus
     
  6. Phil Allison

    Phil Allison Guest

    "Dorfus Dippintush Fucking IDIOT "


    ** That is not any kind of point at all - you ASD fucked IDIOT.





    ....... Phil
     
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