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适用范围
This report is a summary of information concerning the measurement of light at levels between those of
photopic vision, where V(X) applies, and scotopicvision, for which V(Ai)s used. There is currently no official
CIE system recommended for measuring iight at these mesopic levels. Consequently many people
use photopic photometers, a fact which results in improper evaluation of the iight from many of the newer
sources of illumination.
This report contains a history of CIE sqgestions, a discussion of the special problems involved,
and descriptions of five current systems proposed for evaluation, together with examples of the calculations
required.