This set includes 2 x H9 Xenon bulbs; 2 x Ballast units and wiring to directly replace existing H9 Halogen bulbs. A H9 Xenon bulb (35watt, 6000k) creates 3 times more light than a standard Halogen bulb. Xenon bulbs in the 6000k range create a pale blue light which to human eyes gives the best night vision similar to day-light.