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Thread: LED parking lot replacement corn cobb style bulbs ( FYI )

  1. #11
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    Quote Originally Posted by steve66 View Post

    So my personal opinion is that it is usually a waste to replace MH lamps or Fluorescent lamps with LED replacements that just try to mimic the distribution of these lamps and fixtures. You probably wind up with something less efficient than what you started with.

    So IMO, the only way to reliably improve efficiency of a MH or LED lamp/fixture is to replace the entire fixture with an LED fixture. Something that is designed from the ground up for the directional properties of LED's.
    i agree 100%. I was a member of the IES and attended the Street and Area Lighting conferences for many years and saw the beginnings of LED in 2008. An HPS or MH lamp is a point source and putting in a corn cob LED lamp yields poor photmetrics. Most failures in LED sources are the driver, and in a cord cob they are in the lamp. One big issue with LEDs is heat and a new fixture will be designed for that

    Replace the entire fixture, there are many quality mfgs now, GE, Hubble, etc. Your local wholesale house will have lighting department who can assist with meeting the IES requirements. Also look for POCO rebates.
    I would also suggest a 7 pin PE socket instead of a 3 pin, the 7 pin allows monitoring and control, but a 3 pin PE can be used
    Replace the entire fixture and it should be good for 20 years.
    Moderator-Washington State
    Ancora Imparo

  2. #12
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    Be careful who you purchase new LED fixtures from. 20 Years might be a bit of a stretch.

    https://www.freep.com/story/news/loc...ed/1134222001/

    MTW Ω

  3. #13
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    Quote Originally Posted by PaulMmn View Post
    I was at a demo one time, and the presenter lit a fluorescent tube, then an LED stick with the same light output, and nearly blinded us! Because all of the light went in one direction.

    A lot of the fluorescent tube LED replacements are a 'strip light,' with the LEDs on one side. Some will pivot a few degrees so you can optimize coverage.
    That may be a little better, but these will still be installed inside a fixture with all the optics designed for a fluorescent tube.

    Its just so much better to fixtures designed for LED's.

    Unscrupulous sales people will often overstate the benefits of their products by ignoring the effects the fixture has on the light.

    When you buy a quality LED fixture, the light output, losses, and efficiency listed is always for the entire system - lamp and system. When an LED fixture says it provides 4800 lumens, that's pretty much the whole story.

    A LED corn cob lamp may also provide 4800 lumens, but once its placed in a fluorescent fixture, you may only get 3800 lumens. Salespeople tend to ignore that last number.

  4. #14
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    Quote Originally Posted by MTW View Post
    Be careful who you purchase new LED fixtures from. 20 Years might be a bit of a stretch.

    https://www.freep.com/story/news/loc...ed/1134222001/

    MTW Ω
    Yes, and what you bought last month is not the same as now, nor next month.

    Local supply house replaced an LED fixture that suffered premature EOL. The minor problem being that, although it is supposedly the same fixture, the color difference is noticeable enough the customer wants them all replaced. Free, off course.
    Tom
    TBLO

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