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See Chinese contents: GB 37478-2019 GB 37478-2019: Minimum allowable values of energy efficiency and energy efficiency grades of LED luminaires for road and tunnel lighting
This Standard specifies the energy efficiency grades, minimum allowable values of energy efficiency, and test methods of LED luminaires for road and tunnel lighting. This Standard is applicable to LED luminaires for road and tunnel lighting with rated voltage of AC 220 V and frequency of 50 Hz.
