HID: High Intensity Discharge Lamp. It is composed of ballast and lamp.Working principlefor HID:through ballasts, it enables voltage at dc 12V on vehicle to rise to 23,000Vinstantly and enables inert gas梄enon to be excited and dissociated electricity,It generates light source that is near to sunlight color at noon,then steadies in 85V and keeps discharging.HID lamp has many feathers: 1. Super brightnes: its luminous flux(3,000Lm)is 3 times as that of the halogen tungsten lamp(800Lm) so that it can emits more light. 2. Extremely long life: the halogen lamp can only last 400 hours continuously at most, But HID Xenon lamp provides 5,000 hours service live which is the same with the Automobile life (the European standard) 3. Excellent saved power: Halogen lamp usually consumes about 55-65W electric power averagely. But HID Xenon lamp only consumes 35W,which can draw less power from you vehicles electrical system and dramatically improve the performance of the vehicles. 4. Brilliant colour temperture: The colour temperature is approximately 5,000K-8,000K compared to 3,000K-4,200K for halogen lamp, which is comfortable to our eyes, also benefit for the safe driving indirectly. 5. Reliable security: Sealed by advanced irrigative technology, HID Xenon lamp is with high intensity, waterproof, dustproof, shockproof properties. Convenient installation: Only insert HID Xenon lamp the original lamp hole, fix ballast and connect power supply. No need to alter any part of original vehicle