A1.2 Artificial Daylight Source —This may be a separate
unit or an integral part of the colorimeter where the combined
system of a source lamp (A1.2.1), daylight filter glass (A1.3),
and flashed opal glass (A1.2.2) are capable of producing
spectral characteristics similar to northern daylight (that is,
color temperature of 6700 6 300 K) for use in the test.