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GSL_CONST_MKSA_STILBThe luminance of 1 stilb.
GSL_CONST_MKSA_LUMENThe luminous flux of 1 lumen.
GSL_CONST_MKSA_LUXThe illuminance of 1 lux.
GSL_CONST_MKSA_PHOTThe illuminance of 1 phot.
GSL_CONST_MKSA_FOOTCANDLEThe illuminance of 1 footcandle.
GSL_CONST_MKSA_LAMBERTThe luminance of 1 lambert.
GSL_CONST_MKSA_FOOTLAMBERTThe luminance of 1 footlambert.