Home / Standards / GB/T 33720-2017 GB/T 33720-2017 Active Accelerated test method of luminous flux depreciation for LED lighting products LED照明产品光通量衰减加速试验方法 Standard Type GBT ICS 29.140.01 CCS K70 Status 现行 Issue Date 2017-05-12 Implementation 2017-12-01 Responsible Dept 科技部 Drafting Unit N/A