Brite Box illuminates the low beams (and fog lights with Fog Light Control models) when the high beams are activated which allows 100% of the lighting potential of the vehicle to be utilized. Brite Box provides an even carpet of light that stretches from near to far. Safety and comfort are improved because the driver can now see a larger portion of the road. The safety benefits and circuitry of Brite Box has been proven in millions of miles of over the road testing, and is used by law enforcement and transportation companies. Available for many popular trucks and suv's, from major mfrs like Chevy, GMC, Ford, Dodge & Toyota.