國(guó)外標(biāo)準(zhǔn)光源的定義:標(biāo)準(zhǔn)光源定義AArtificial illuminant such as a tungsten lamp at a color temperature of 2880°KBNoon sunlight at 4874° KCAverage daylight (overcast sky) at 6774° KD50Typical bright daylight (overcast sky) at 5000° KD55Ty…