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Thread: Long Day Lighting

  1. #1
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    Long Day Lighting

    For those of you working in the Dairy industry, what has been your experience with LDL installation? Grow your own controls or readymade?
    Tom
    TBLO

  2. #2
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    Windsor, CO NEC: 2017
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    No idea what you're talking about. Can you explain what that is?

  3. #3
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    Milk production is increased considerably, 5 lbs/head, when cows are exposed up to 16 hrs per day of about 15-20 ft candles, followed by 8 hrs of darkness.

    Small barns would be easy enough, 500' are going to be somewhat different.
    Tom
    TBLO

  4. #4
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    We do the dairy work for most of the dairies in this area, a couple of them are HUGE(22,500 and 7,500 milking cows) and none of them use long day lighting. We're currently wiring a 10,000 milking cow dairy right now from the ground up, which I built the lighting control panels for, and they didn't request long day lighting either.

    I've heard of this for chicken farms and getting the hens to lay one extra egg/week but haven't seen it yet with dairies. Is this something you've just started hearing about it or have you been doing LDL for a while now?

    I know some of these dairy farmers aren't willing to jump on the bandwagon until they've seen it proven with a definite track record, so maybe our customers are just giving it a little more time until they tell me they want to make some lighting changes!

  5. #5
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    New manager of a 3000 head Dairy is requesting it. They had very good results at a previous Dairy in Kansas. These bars are due for a rewire anyway and what the heck, it's just dollars.
    Tom
    TBLO

  6. #6
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    Quote Originally Posted by ptonsparky View Post
    Milk production is increased considerably, 5 lbs/head, when cows are exposed up to 16 hrs per day of about 15-20 ft candles, followed by 8 hrs of darkness.

    Small barns would be easy enough, 500' are going to be somewhat different.
    i'd think 0-10v dimming would be the best way to get the setpoint where
    you want it.

    it's not used in this application, but daylight harvesting would work excellently.
    it'll maintain a setpoint of whatever footcandles you want, so if you have some
    ambient light coming in, it'll allow for that, and maintain a constant light.

    i'd do it with nLight. a couple thousand dollars probably would get you enough
    hardware to do almost any size facility. local controls could be programmed with
    a couple buttons.... one to go full bright for when you have to work in the facility,
    and need bright light, and it would be a local override that would only be full bright
    for an hour, then revert.

    and you could put timers into the controls effortlessly.

    is there a color temperature that is best? 5000k?
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  7. #7
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    I don't know if there is a preferred K or CRI but I will be finding out.
    Tom
    TBLO

  8. #8
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    Quote Originally Posted by Fulthrotl View Post
    i'd think 0-10v dimming would be the best way to get the setpoint where
    you want it.

    it's not used in this application, but daylight harvesting would work excellently.
    it'll maintain a setpoint of whatever footcandles you want, so if you have some
    ambient light coming in, it'll allow for that, and maintain a constant light.

    i'd do it with nLight. a couple thousand dollars probably would get you enough
    hardware to do almost any size facility. local controls could be programmed with
    a couple buttons.... one to go full bright for when you have to work in the facility,
    and need bright light, and it would be a local override that would only be full bright
    for an hour, then revert.

    and you could put timers into the controls effortlessly.

    is there a color temperature that is best? 5000k?
    That's good to know.

    A guy like myself doesn't get into 0-10volt dimming doing dairies and other such ag work, but that's the great thing about using this forum as a sounding board to hear others experiences on what works well. I know we've done the wiring for 0-10v dimming in schools and similar places before, but I believe the systems have all been spec'ed and we weren't the ones doing the programming. Thanks for your input. If this comes up in the future, I may have to pick your brain on it a little.

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