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Thread: Led parking lot lights

  1. #1
    Flashaholic* Aaron1100us's Avatar
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    Default Led parking lot lights

    Any idea what leds are used in parking lot lights? They are crazy bright, way more than a high amp xml. Thought the xml was the brightest avaiable led on the market. Cell phone pic of one of the new lights in our parking lot



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  2. #2
    Flashaholic* Aaron1100us's Avatar
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    Default

    Old parking lot light.



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  3. #3
    Flashaholic
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    Default Re: Led parking lot lights

    There is no way we are going to be able to identify what LED it is based on a pic like that . The XM-L is a nice bright efficient LED to design with but I wouldn't call it the brightest, as companys like Bridgelux and Edison Opto have the array leds that emit in the 4000lm range.

    Also, streetlight optics are very complex and play a significant role in the spread and shaping of the light output. Nice to see people changing over and embracing LED streetlights though.

  4. #4
    Flashaholic kingofwylietx's Avatar
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    Default Re: Led parking lot lights

    LED's are much easier to identify if you get a close-up picture of it when it is turned OFF.

  5. #5
    Flashaholic* idleprocess's Avatar
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    Default Re: Led parking lot lights

    Most area lighting isn't going to use bleeding-edge LED's for two reasons: lumens/$, and thermal/electrical ruggedness.

    Relative to lower-performing LED's, bleeding-edge products have a price premium. Flashlight and specialty luminaire manufacturers will pay this premium, but area lighting manufacturers have to compete against florescent and arc lamps' lower cost of acquisition, and similar lumens/watt, and (generally better) lumens/package performance. They will prefer older-generation LED's due to their lower cost per unit and better price/performance ratio.

    Another plus of older-generation LED's is maturity, which leads to more robust thermal and electrical performance - LED manufacturers have had time to further improve processes for existing technology so its previousl bleeding-edge performance isn't stressing the parts so hard. Another aspect of product maturity is better consistency and availability: if you want something particular - ie >100lm / 3.2V@350mA / 4200K CCT / with a <0.25% failure rate after 10,000 hours / all @ 75C junction temp - by the container load monthly, it's easier to get that from an established product than a new one.
    I apologize that this letter is so long; I did not have time to write a short letter

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