Question 2 . Why do we need "HID" ? Have you ever read " blind driving" stunt ? Will not gotten me very nervous for the performers ? And when you're black Driving at night without lights in the road, but the road curved and narrow , it will not have the feeling of stunts ? At this time , if Your headlights will be brighter , according farther , then certainly increase traffic safety lot, "HID" is based on the night Between road safety and developed a new generation of headlamps. Distinguished by: ( 1 ) visual light ball across the electrodes are worn out serious phenomenon . ( 2 ) whether the visual ceramic tube rupture , breakage . ( 3 ) whether the mesh wire breakage sight . ( 4 ) Are there visual lamp breakage , breakage . ( 5 ) whether the visual lamp column fracture breakage . ( 6 ) Are there loose tube is not strong visual phenomenon . ( 7 ) Are there visual Base fall off phenomenon. ( 8 ) Are there visual lamp power cord fall off phenomenon. ( 9 ) whether the ball lights visually for cracks or broken phenomenon . Testing method: ( A ) take a good Ballast (stabilizer ) , HID lamp as a reference test . ( 2 ) Prepare a power supply voltage to be adjusted to 13.20V as a test reference voltage. ( 3 ) are first of all the wiring properly connected , turn the power on to test whether the bulb lighting . ( 4 ) If the power is not turned on lights HID lamps, HID said to be damaged.