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Spectral luminous efficiency functions in the mesopic range.

K Sagawa, K Takeichi

Journal of the Optical Society of America. A, Optics and Image Science

|January 1, 1986

Summary

Researchers measured spectral luminous efficiency functions for mesopic vision across various light levels. The study found these functions change with illuminance, requiring specific functions for each level in mesopic photometry.

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Area of Science:

Photometry
Vision Science
Colorimetry

Background:

Mesopic vision, the intermediate light range between scotopic (low light) and photopic (bright light) vision, lacks standardized luminous efficiency functions.
Understanding mesopic vision is crucial for accurate lighting design and visual performance assessment.

Purpose of the Study:

To establish a comprehensive data set for mesopic vision spectral luminous efficiency functions.
To investigate the variation of these functions across different retinal illuminance levels.
To explore empirical formulas for mesopic luminous efficiency based on photopic and scotopic functions.

Main Methods:

Direct brightness matching was employed to measure spectral luminous efficiency.
Measurements were conducted using a 10-degree field across nine retinal illuminance levels (100 to 0.01 Trolands).
Data were collected from 12 human subjects.

Main Results:

The averaged spectral luminous efficiency function for mesopic vision demonstrated a gradual change in form with varying retinal illuminance.
Significant variations were observed across the tested illuminance range, indicating the need for level-specific functions.
The study initiated an attempt to derive an empirical formula combining photopic and scotopic functions.

Conclusions:

The spectral luminous efficiency function in the mesopic range is not static and varies significantly with retinal illuminance.
A single mesopic function is insufficient; functions must be established for all relevant mesopic illuminance levels.
Further research into empirical formulas is warranted to simplify mesopic photometry.

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