These PIAA Xtreme White Plus light bulbs provide a brilliant cool white light that will light up road hazards and street signs long before a normal halogen bulb. They are manufactured to SAE-recommended specifications. PIAA Xtreme White Plus light bulbs operate at 4,000 degrees Kelvin, which is much higher than conventional halogen-style bulbs. Get rid of those factory light bulbs in your vehicle--upgrade to PIAA Xtreme White Plus light bulbs and experience the difference.