Technical Parameters: 70 head/50 head 
Luminance ：150,000/120,000Lux
Color temperature ：4300K±500K
Spot diameter  ：12 0- 320mm
lllumination depth ：≥800mm
Light-adjusting mode ：Eight grade dimmer system
Temperature at surgeon’s head ：≤2℃
Temperture at surgical field : ≤8℃
Color indication index ：≥97%
Working distance: 55-170cm
Vertical adjustment range: 115cm
Power supply ：220V±22V 50Hz±1Hz
Input power ：220W 
Power of bulb (W) ：24V/150W
Bulb average life : 1000h
Shift of major and stand-by lamps ：YES
Lowest height of installation ：2900mm
Standard height of installation : 275-310cm