illumination climate[ə‚lü·mə‚nā·shən ‚klī·mət]
Also known as light climate.
The worldwide distribution of natural light from the sun and sky (direct solar radiation plus diffuse sky radiation) as received on a horizontal surface.
The character of total illumination at any given place.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.