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Vision response vs. Planck’s Black Body Curve


Color temperature is based upon the idea of a Planck black-body radiator.

Here’s a Tech Note that shows how our eyes respond to the Planck Black-Body radiator.

For a lamp filament at a certain ‘color temperature’ there’s a curve of how our eyes

respond to the lamp. Pete put this into a MathCAD model, and there’s a pdf here

that shows off a few nice graphs.


visualresponseintegral-011308

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This entry was posted on Saturday, March 14th, 2009 and is filed under application notes, how-to, math, metrology, optics, tech notes, technical articles. You can follow any responses to this entry through RSS 2.0. Both comments and pings are currently closed.

  1. #1 by Vegus on July 9th, 2009

    Вы попали в самую точку. Я думаю, что это отличная мысль.

    (translation: “You’ve hit the nail on the head. I think that this is a marvelous idea.”)

    (translation services for Actinica provided by Mark Orton, aka Mr. Wonderful).

  2. #2 by Генадий Петрович on July 13th, 2009

    Я извиняюсь, но, по-моему, Вы допускаете ошибку. Могу отстоять свою позицию. Пишите мне в PM, пообщаемся.

    (I apologize, but I think you make a mistake. I can defend my position. Write to me in PM, talk to each other.)

  3. #3 by Michael Beach on July 13th, 2009

    Please tell me where my mistake is. I am glad to learn something new!

  4. #4 by Алексей Андреевич on July 14th, 2009

    В этом что-то есть. Спасибо за помощь в этом вопросе, я тоже считаю, что чем проще тем лучше…

    (In this something exists. Thanks for help in this question, I also consider that the simpler the better…)(from Yahoo babelfish translator)

    (This is something to eat. Thank you for your assistance in this matter, I also believe that the simpler the better …)(from Google’s translator)

  5. #5 by Michael Beach on July 15th, 2009

    We thought of the subject matter during the course of our work in optics and photography. The units of optical power used by physics professionals differs by the units used in the field of photography and illumination. Since we had difficulty finding articles that could convert from basic physics units to units of ‘candelas’ or the ‘lumen’ and the Watt, we started some work on this type of article. As LED lighting starts to be compared to incandescent lamps, there will be much confusion, without these conversions, since the old incandescent lamps are rated by their ‘wattage’ which is just INPUT power NOT light efficacy.

    AND our eyes have different sensitivity than cameras do (see some of our other articles).

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