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Thread: Two F4T5/CW bulbs failed

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    Computer Programmer Bill Arden's Avatar
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    Sep 2006
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    MN, USA
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    Default Two F4T5/CW bulbs failed

    I bought three of these small 4W "under cabinet lights" (W-mart, Lights Of Am...) Model 7104

    I am annoyed to say that one bulb failed after a month and another after two months.

    The filament is open on one side with a dark color on the bulb.

    Replacing the bulb fixed the light.

    I am trying to figure out why the filament would fail as I had these lights are on all the time (24/7 path lights to let me leave off the main shop lights)

    I am tempted to take one of the lights apart to see if they used a "continuous run" capacitor type circuit to heat the filament using the main Square wave output.

    Edit: Yes it does use a "continuous run" filament circuit just like the cheep CF bulbs.
    I'll hook it up to the scope to see if I can add a Neon bulb starter to it.

    Edit again: Nope. The light needs the filament to be hot in order to keep it light.
    Last edited by Bill Arden; 01-19-2008 at 01:33 PM.
    Important note Ė I donít know man made laws, just laws of physics
    Disclaimer: I'm a big fan of Darwin awards.

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