The PIAA H4 Style Super Plasma GT-X Low Beam 60/55W=135/120 Watt Bulb uses twin-color technology to create a distinctive 5000K bluish-purple low beam light and an Xtreme White Plus high beam, with a purple topcoat to give an overall purple look to your headlamp even when off. Efficiently producing 135 watts of light for just 60 watts of power on the high beam, this halogen lamp is made of a high-quality, heat-resistant tube and sold in a twin pack. The PIAA Corporation has nearly half a century of experience in designing and manufacturing high-quality vehicle bulbs and lights.