High quality quartz glass Bulbs, easy Installation.40% less consumption than halogen Light bulbs.4 times light intensity than halogen Light BulbsLife-Expectancy: 10000-15000 hours. 5 Times Life Span than halogen Light BulbsWattage: 55WColor Temperatures Available: 6000kBulb Size: H4Color: As shownmaterial: metalPackage Includes:2x HID Bi-xenon Hi/Lo Beam Bulbs35W 55W:This xenon lamps with 35W will bring you the unprecedented comfort and safe driving at night.The 55W use more to produce . The 55W HID kits cost generally more than the 35W HID kits.This is personal choice. If you need maximum light output, if you drive on very dark roads, you will want to install a 55W HID kits for more lighting .HID Temperature and Color:The color of light is measure and expressed in degrees Kelvin (K). The color spectrum ranges from a red to purple. HID headlamps do not have this wide of a range though there are different bulbs that skew toward either extreme. Most are more focused on the center of that range.4,300K is the temperature that is closest to natural daylight. Factory HID headlamps are setup for this color temperature. Conventional Halogen filament bulbs are yellowish which is equivalent to a 3,300K temperature. 6,000K has a bluish tint and temperatures above that are increasingly blue shifting to a purple tint.Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.