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Sunday, September 9, 2018

Glossary - O


O 

object color† the color of the light reflected or transmitted by an object when illuminated by a standard light source, such as CIE source A, B, C, or D65. See standard source and perceived object color.  

occulting light a rhythmic light in which the periods of light are clearly longer than the periods of darkness. 

opaque† impenetrable to light; not able to transmit, or not transmitting light. 

orientation the relation of a building with respect to compass directions. 

overcast sky one that has 100% cloud cover; the sun is not visible. 
overhang the distance between a vertical line passing through a specified point (often the photometric center) of a luminaire and the curb or edge of a roadway.

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