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Power: 10W/20W/30W/40W Color: Cold white / Natural white /Warm white Size: 19*19MM Serial and parallel mode: 10W=10C2B,20W=10C4B 30W=10C6B ,40W=10C8B Chip crystal size: Bridgelux 18*35mil Chip substrate thickness:1mm Lumens: 10W=1200ml,20W=2400ml 30W=3600ml,40W=4800ml Input voltage: DC30-33V Input Current: 10W=300mA,20W=600mA, 30W=900mA,40W=1200mA CRI: Ra≥90 Chip material: Gold thread 99% Imported Bridgelux crystal chip