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(General Physics) physics artificial light having approximately the same spectral characteristics as natural daylight
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Illumination of an intensity greater than the light of a full moon on a clear night. (The optimum illumination is the equivalent of daylight.) See also battlefield illumination.
Dictionary of Military and Associated Terms. US Department of Defense 2005.