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Related Experiment Videos

Glare from daylighting in buildings.

R G Hopkinson1

  • 1Environmental Design and Engineering, University College London.

Applied Ergonomics
|December 1, 1972
PubMed
Summary

Glare from windows, especially the bright sky, causes discomfort and fatigue. Reducing window sky view and increasing room brightness can mitigate this visual annoyance.

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Area of Science:

  • Building science
  • Environmental psychology
  • Human factors engineering

Background:

  • Glare from direct sky view through windows causes visual discomfort and fatigue.
  • Both disabling and annoying effects of glare have been documented.
  • Understanding glare is crucial for optimizing indoor environments.

Purpose of the Study:

  • To summarize recent conclusions on the causes and effects of glare.
  • To identify key parameters influencing glare.
  • To propose methods for glare reduction and control.

Main Methods:

  • Analysis of glare as a function of window size, sky brightness, and interior room brightness.
  • Review of laboratory studies on glare effects.
  • Development of a computable Glare Index.

Main Results:

  • Glare is directly proportional to window size and sky brightness.
  • Glare is inversely proportional to interior room brightness.
  • Glare can be reduced by decreasing the visible sky area and increasing interior reflectance.

Conclusions:

  • Glare can be effectively managed by controlling window-to-sky luminance ratios and interior surface reflectance.
  • A Glare Index can be computed to quantify and control glare levels.
  • Codified Glare Index values can ensure acceptable tolerance limits for visual comfort.

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