Abstract

Federal specifications restrict glare of reflected sunlight from certain automotive-trim items by calling for a maximum specular (mirrorlike) reflectance of 2% (40 gloss units), thus reducing glare by decreasing the luminance of the reflection. This approach, which requires the use of matte surfaces, has disadvantages. Observations showed that glare of sunlight reflected from bright surfaces could be reduced as effectively by demagnifying the sun’s image by use of increased surface curvature. A glare comparator was constructed, by which glare control by restriction of luminance was related visually to control by restriction of angular area. About 1000 observations were made during the course of more than 150 tests. Results showed that glare was regulated to the same extent by a proportional change of either luminance or angular area.

© 1968 Optical Society of America

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References

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  1. Federal Standard No. 515/13a, Federal Register 31, No. 136, 15July1967 (General Services Administration).
  2. Motor Vehicle Safety Standard No. 107, Federal Register 32, No. 23, 3Feb.1967 (Department of Commerce).
  3. R. S. Hunter (private communication), Hunter Associates Laboratory, Inc., Fairfax, Virginia.
  4. M. J. Men, Am. J. Optometry 40, 61 (1963).
    [CrossRef]

1963 (1)

M. J. Men, Am. J. Optometry 40, 61 (1963).
[CrossRef]

Hunter, R. S.

R. S. Hunter (private communication), Hunter Associates Laboratory, Inc., Fairfax, Virginia.

Men, M. J.

M. J. Men, Am. J. Optometry 40, 61 (1963).
[CrossRef]

Am. J. Optometry (1)

M. J. Men, Am. J. Optometry 40, 61 (1963).
[CrossRef]

Other (3)

Federal Standard No. 515/13a, Federal Register 31, No. 136, 15July1967 (General Services Administration).

Motor Vehicle Safety Standard No. 107, Federal Register 32, No. 23, 3Feb.1967 (Department of Commerce).

R. S. Hunter (private communication), Hunter Associates Laboratory, Inc., Fairfax, Virginia.

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Figures (2)

Fig. 1
Fig. 1

Schematic of glare comparator as seen by observer.

Fig. 2
Fig. 2

Isoglare plots from a representative comparison of two glare sources. Average straight line has a slope of 1.00, an ordinate intercept of 0.155, and a linear correlation coefficient of 0.99.

Tables (2)

Tables Icon

Table I List of sizes of left glare apertures.

Tables Icon

Table II Characteristics of straight lines obtained from visual isoglare comparisons of two white light sources.