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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