High quality quartz glass Bulbs, easy Installation. 40% less consumption than halogen Light bulbs. 4 light intensity than halogen Light Bulbs Life-Expectancy: 10000-15000 hours. 5 Life Span than halogen Light Bulbs Wattage: 55W Color Temperatures Available: 6000k Bulb Size: H4 Color: As shown material: metal Package Includes: 2x HID Bi-xenon Hi/Lo Dual Beam Bulbs 35W 55W: This xenon lamps with 35W will bring you the unprecedented comfort and safe driving at night. The 55W 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 skew toward either extreme. are more focused on the center of range. 4,300K is the temperature 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 and temperatures above are increasingly blue shifting to a purple . Note:Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3 cm.