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Thread: Fiber Optic bulb dim and won't stay lit

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    Fiber Optic bulb dim and won't stay lit

    Hello,
    We recently purchased a house with our first inground pool. It has a Jandy G12 Fiber Optic Pool light with three outlets inside the pool. The Metal Halide Bulb shuts off after about 3 min. After about 5 min the light bulb comes back on. I have a feeling the bulb is not getting as bright as it should since you can barely see the light at the outlets in the pool. Please help. Is it the ballast? Starter? other?
    John
    18k gallon, plaster, Hayward DE6020 filter, 2.0 HP Hayward pump, H Series Hayward heater, inline chlorinator (that I no longer use as I have switched to BBB)

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    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: Fiber Optic bulb dim and won't stay lit

    Bulb or cooling fan. More likely the bulb.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Fiber Optic bulb dim and won't stay lit

    Already replaced the bulb. Cooling fan is in working order.
    18k gallon, plaster, Hayward DE6020 filter, 2.0 HP Hayward pump, H Series Hayward heater, inline chlorinator (that I no longer use as I have switched to BBB)

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    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: Fiber Optic bulb dim and won't stay lit

    AFAIR, Jandy doesn't make fiber light sources. Usually it's a Fiberstar or Pentair PG2000 light tower.

    Several things are possible:

    1) Wrong bulb
    2) Defective bulb
    3) Dying transformer
    4) Dying switch
    5) Loose wires
    6) Clogged Vents

    After a bulb strikes it's arc, it takes a couple minutes to gain full intensity. When it is shut off, the tower waits for it cool before re-arcing to prevent shattering due to rapid heating/cooling.

    How close is the fiber bundle to the lamp? This can have a huge impact. Improperly terminated bundles or melted and dirty color wheels will dim things. Is it's surface flat and clean? Fiber bundles can deteriorate if the gaskets on the pool outlet have failed and allowed water to access it.

    You might consider bringing in either an experienced pool service guy to figure out which. You may have more than one issue. Have you seen this system working correctly in the past?

    Helpful links

    Fiberstar Owners Manual link : http://www.fiberstars.com/fiberstars/_a ... Manual.pdf

    Pentair PG2000 Installation Guide: http://www.pentairpool.com/pdfs/PG2000I ... tionIg.pdf


    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Join Date
    Apr 2008
    Location
    Central Texas
    Posts
    326

    Re: Fiber Optic bulb dim and won't stay lit

    Our pool has an older Fiberstars setup that would randomly shut itself off. I found that the fuse holder was corroded to the point that it didn't keep a good connection. I installed a new fuse holder that I picked up at Radio Shack for around $3 and all seems well, at least until this one corrodes also. Some type of weatherproof military style fuse holder would be much better for the conditions these things have to live in.
    26,000 Gallon Gunnite IGP
    2 HP Challenger High Head Pump
    60sf Nautilus DE filter
    Polaris 280

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