TERMIUM Plus®

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WINDOW EFFICIENCY RATIO [1 record]

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Alphabetical list of terms

Record 1 1987-05-07

English

Subject field(s)
  • Metrology and Units of Measure
  • Lighting (Construction)
DEF

A measure of daylight illumination at a point on a given plane expressed as a ratio of the illumination on the given plane at that point to the simultaneous exterior illumination on a horizontal plane from the whole of an unobstructed sky of assumed or known luminance (photometric brightness) distribution ... [direct] sunlight ... [being] excluded from both interior and exterior values of illumination.

French

Domaine(s)
  • Unités de mesure et métrologie
  • Éclairage (Construction)
DEF

(...) rapport entre l'éclairement moyen (...) [d'une] pièce (ou parfois en un point bien précis de celle-ci, généralement sur le plan de travail) et celui d'une surface horizontale exposée directement et sans obstacles ni écrans à la lumière du ciel, la lumière solaire directe étant exclue.

Spanish

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