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SpecificationPower: 12W/18W/24W/30W/36W/42W Color: White 6000K/Warm White 3000K/Natural White 4000K Size: 19*19MM=0*0 Serial and parallel mode: 12C2B/12C3B/12C4B/12C5B/12C6B/12C7B Chip crystal size: 26*30mil Chip substrate thickness: 1mm Lumens: 120lm/W (120 lumens in line with 1 watt, lumens is the unit of brightness), then 12W=120*12W=1440lm Input voltage: DC36-39V Input current: 280-300mA/400-450mA/560-600mA650-750MA/840-900MA/900-1050mA CRI: Ra≥97 Gold thread 99% one hundred pc Imported Bridgelux crystal chip Superconducting aluminum substrate W/(m·K)=4