This Japanese Industrial Standard specifies the measurement methods for the lumen maintenance factor and the chromaticity change of a white light emitting diode (LED) for general lighting. This method is also applicable to LED luminaires.
JIS C 8152-3:2013 規範的参照
JIS C 8152-1 一般照明用白色発光ダイオードの測光 その1:発光ダイオード(LED)のパッケージング