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Related Experiment Videos

Brightness luminous-efficiency functions for 2 degrees and 10 degrees fields

M Ikeda, H Yaguchi, K Sagawa

    Journal of the Optical Society of America
    |December 1, 1982
    PubMed
    Summary
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    The standard luminous-efficiency function needs revision. New research provides a revised 2-degree brightness-matching luminous-efficiency function, crucial for accurate lighting and vision science.

    Area of Science:

    • Vision Science
    • Illuminating Engineering
    • Physiological Optics

    Background:

    • The CIE V lambda function is limited for representing luminous efficiency based on brightness matching.
    • CIE Technical Committee 1.4 Vision (TC 1.4) developed a 2-degree brightness-matching luminous-efficiency function using 31 observers.

    Purpose of the Study:

    • To analyze conditions of previous studies and revise the TC 1.4 luminous-efficiency function.
    • To derive an averaged luminous-efficiency function for a 2-degree field by incorporating additional Japanese subject data.
    • To present a luminous-efficiency function for a 10-degree field and explore its application in assessing broadband source brightness.

    Main Methods:

    • Analysis of seven studies on brightness-matching luminous-efficiency functions.

    Related Experiment Videos

  • Revision of the TC 1.4 function using data from 19 subjects after excluding inappropriate data.
  • Derivation of an averaged 2-degree luminous-efficiency function by adding data from 18 Japanese subjects.
  • Presentation of a 10-degree luminous-efficiency function based on nine Japanese subjects.

    • Main Results:

    • A revised 2-degree brightness-matching luminous-efficiency function was established.
    • An averaged 2-degree luminous-efficiency function, consistent with the revised TC 1.4 function, was derived.
    • A 10-degree luminous-efficiency function was presented, showing minimal differences from the 2-degree function at short wavelengths after normalization.
    • A theoretical method for assessing 2-degree broadband source brightness using the derived function was introduced.

    Conclusions:

    • The revised TC 1.4 function and the derived averaged function represent a standard luminous-efficiency function for a 2-degree field.
    • The 10-degree function provides valuable data for specific applications in vision science.
    • The theoretical approach offers a practical tool for evaluating the brightness of broadband light sources.