llumination At 16" (40.64 cm) Focal Length: 1,700 fc (18,298 lux) nominal Color Temperature: 4,250 K to 4,750 K Adjustable Spot Size: diameter: 4" (10 cm) to 12" (30 cm) Light Head Size: 2" (5.08 cm) diameter; 5.32" (13.51 cm) long Flex Arm Length: 54.5" (138 cm) Light Source: single LED Electrical: 110-240 VAC, 0.05-0.10 A, 50/60 Hz Standards CAN/CSA C22.2 No. 60601-1 UL 60601-1