Zone Tech LI0015 35W HID Ballast (Premium Quality Universal Replacement 35W HID Ballast) The ballast has a superior technology. Instead of having a filament, it is replaced with Xenon gas. When the Xenon gas ignites, it produces a vivid light that's more powerful than a bulb The Zone Tech ballast Emits a type of light that closely resembles natural daylight and is therefore easier on human eyes The Zone Tech HID ballast are manufactured under the strictest of quality control. The Ballasts are also shockproof and 100% waterproof and are resistant to heat and aging The Zone Tech ballast uses HID (high intensity discharge) lighting. HID lights are currently used in most Sports arenas, stadiums, and train stations worldwide The Zone Tech HID ballast are designed to run for over 3500 hours; which is usually good for life to your vehicle