Specification300W (66B1C=66 parallel 10 series)300W type of beads: 660pcsVoltage: 30-34VCurrent: 3000-9000mA (MAX)Band: 380-840NMSize: diameter 110mm (4)Luminous surface: 90mm (3)Aluminum substrate: 1 conditions: A powerful radiator and fan and LED power power are required for proper operation. 500W (110B1C=110 parallel 10 series)Number of 500W lamp beads: 1100pcsVoltage: 30-34VCurrent: 3000-15000mA (MAX)Band: 380-840NMSize: diameter 110mm (4)Luminous surface: 90mm (3)Aluminum substrate: 1 conditions: A powerful radiator and fan and LED drive energy are required for proper operation.