Lighting Issues

Discussion in 'Pond Archive' started by Bill O'Meally, Jul 9, 2011.

  1. Do others here use under-water low-voltage halogen lights in their
    ponds? A few years after their installation, I found myself constantly
    replacing bulbs which did not look burned out. I finally realized that
    the prongs on the bulb and the sockets in the fixtures were getting
    corroded. I have since re-located the lights so that they are (mostly)
    out of the water, which made some difference. I have found that a bit
    of emory cloth to clean the corrosion off the prongs is a simpler (and
    cheaper) solution than replacing the bulbs. They still get corrosion, I
    suspect because the sockets are still corroded and it spreads to the

    When I first had the pond built 12 years ago, I purchased an attractive
    50-watt copper fixture, only to be chagrined when I read the fine print
    that the copper was toxic to the fish. It sits in its box to this day
    and has been out of mind until recently as I toyed with the idea of
    just replacing all the fixtures. Now, of course my pond is filled with
    water that had gone through copper pipes! My fish are just fine,
    thank-you. What is the issue with the copper then?

    So, in summary, are "underwater" lights that end up getting corroded,
    really truly made to withstand being under water, or did my contractor
    just use crappy fixtures?

    Could I cause serious problems by not submersing the lights? The copper
    light I have specifically says to ONLY use under water. After my
    experience with corrosion, and not having a catastrophe by removing my
    other lights to dry land, I am taking this instruction with a grain of

    Is copper truly toxic to fish?

    Bill O'Meally, Jul 9, 2011
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  2. Bill O'Meally

    Pat Guest

    of the water, which made some difference. I have found that a bit
    You might try some silcone grease

    The fixture probably relies on being subursed for proper cooling.

    Yes, however it depends on the chemistry of your water whether the copper
    will dissolve into the water.
    Pat, Jul 9, 2011
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  3. Bill O'Meally

    Robby1 Guest

    It all depends. If the water is hard then the copper will become coated
    in line which acts as a barrier. Soft water may absorb the minerals and
    yes may harm your fish. To be fair get rid and stop flogging a dead
    horse. If the light are showing corosion then they are fubar, bite the
    bullet and change them.
    Robby1, Jul 10, 2011
  4. Bill O'Meally

    ~ jan Guest

    Agree with everything Pat said.

    IIRC, I believe the worry is when the water has a pH of 7 or less, but one
    might want to google this for sure? Most fish ponds are usually higher...
    check your KH/buffering, as that can make the pH change AM to PM. You need
    buffering to keep your pH somewhat stable. ~ jan
    ~ jan, Jul 10, 2011
  5. Yes, that was the direction I was headed. Has anyone out there had good
    (or bad) experiences with specific brands?

    Thanks all for the great advice!
    Bill O'Meally, Jul 10, 2011
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