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Lab: Why temperature is important for led lights
  • Vitaliy_KiselevVitaliy_Kiselev

    I'll first put one slide from NIST presentation (I'll provide link below)

    image

    So, specs you see comes from manufacturers of leds that are inserted inside light, fresnel for example. And they can differ from real life very much.

    Manufacturers like to spend tiny time for testing to reduce expenses, hence they test at room temperature around 25 degrees and using short pulse, just enough to check parameters.

    In reality temperature inside light is from 50 up to above 100 degrees. And this really affects light. Add to this that at high end of this temperatures you also have accelerated led degradation.

    And remember, Chinese like to design bad heatsinks

    image

    Charts from http://www.cormusa.org/uploads/4_CORM_Workshop_YZ.pdf

    sample249.jpg
    800 x 565 - 78K
    sample250.jpg
    800 x 552 - 84K
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