(under subclass 229) Subject matter including a source of
light which constitutes a standard (known intensity) with which the light whose intensity is to be determined is compared.
SEE OR SEARCH THIS CLASS, SUBCLASS:
46, for variable light standards whether the standard is used for temperature or light intensity tests.
243, for optical testing standards generally.
SEE OR SEARCH CLASS
324, Electricity: Measuring and Testing, 403+, for lamp testing as where the efficiency of the electrical to light conversion of the lamp is determined. However, this Class 356 provides for the mere measurement of the radiation intensity from the lamp.
