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  1. #1

    Underwater Lighting

    Hello all, I'm planning my first pond and have been investigating underwater lighting options. It will be a block build GRP lined pond and I would like wall mounted flush underwater lights. My initial research suggests this is not a very common thing to do and I was wondering why? One of the reasons might be cost-I have seen prices around the £800 mark for two 12V led flush mounted lights which seems crazy. Is lighting from above just as good and are there any cheaper options with underwater lighting? Thanks in advance.



  2. #2
    Quote Originally Posted by SteveW1 View Post
    Hello all, I'm planning my first pond and have been investigating underwater lighting options. It will be a block build GRP lined pond and I would like wall mounted flush underwater lights. My initial research suggests this is not a very common thing to do and I was wondering why? One of the reasons might be cost-I have seen prices around the £800 mark for two 12V led flush mounted lights which seems crazy. Is lighting from above just as good and are there any cheaper options with underwater lighting? Thanks in advance.
    Hi, I think their more suited to ornamental Ponds.
    Last edited by Maddog1; 27-02-2024 at 12:31 AM.

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  4. #3
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    It's a can of worms mate . Been opened lots on here and just by me again the other day

    My believe is that underwater lights get dirty very quick , if they brake a whole world of shit is about to start to fix/replace and the main point which is the general rule on here is that koi don't have eye lids and can't escape the full shine directly in their face ! And it will massively highligh every fine piece of dirt on the water coloum this is a factor even with a drum filter

    Sent from my SM-S918B using Tapatalk
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    "we are water keepers first"

    Johnathan

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  6. #4
    I've found the advanced serch feature now! Also found out that teleost fish like carp have a fixed pupil size that does not change with varying levels of illumination. Is there any evidence that excessive illumination causes them distress? I would imagine if they feed fine in a pond with under water illumination at night then it isnt worrying them too much.

  7. #5
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    this is not meant to be sarcastic or anything mate
    just a good humoured indication of how most koi keepers view underwater pond lighting

    koi lack the ability to close thier eyes and have no eyelids, so have evolved with the light entering from above,
    underwater lighting is an unnatural direction for them from the side, and may be a mild stressor.

    the other downsides are more aesthetic,
    you see 'fines' in the water more easily
    and they quickly get covered in alage that you will need to continually scrape off.
    and can fail and fill with water and are generally not easy to replace.

    but some like them and fit them anyway...
    the choice is up to you...

    Last edited by davethefish1; 27-02-2024 at 12:06 AM.

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  9. #6
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    Just gunna confuse the whole job now lol .

    ( I personally don't like under water lights which is why I asked about light in my roof on my thread )

    but out of curiosity giving the direction of light being from above naturally where dose it stand with windows ?

    Light comes sideways but koi seem to love Windows in the ponds I've seen . ?

    Sent from my SM-S918B using Tapatalk
    Freddyboy the legend

    "we are water keepers first"

    Johnathan

  10. #7
    Quote Originally Posted by SteveW1 View Post
    I've found the advanced serch feature now! Also found out that teleost fish like carp have a fixed pupil size that does not change with varying levels of illumination. Is there any evidence that excessive illumination causes them distress? I would imagine if they feed fine in a pond with under water illumination at night then it isnt worrying them too much.
    If a bright light is shone into the eyes of a human or any other pet, it would shrink its pupils and shut its eyes so bright lights in the eyes obviously are uncomfortable or even painful so I would turn this question around and ask if there's any evidence it doesn't?

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  12. #8
    I have used two of these in my pond.

    https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1

    They have a metal disk which I glued on the wall and they just sit on top of it. Very low consumption; I can easily pull them out to clean them when needs be and I can play with the colours to my kids delight.
    Usually I have them on blue which the fish seem to like
    Price is not bad either.

  13. #9
    In my very fist pond (more of a puddle looking back now) I had one of those all in one filter/pump & light.

    The lens would go green with in days and make the water look green.

    Just dont bother .

    Put some lights around the edge facing down. I think wrighty on youtube has some in his pond.

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