The PIAA HB4-9006 Style Super Plasma GT-X Bulb uses twin-color technology to create a distinctive 5000K rating bluish-purple low beam light and a super white high beam. Made of a high-quality, heat-resistant tube, this limited edition halogen bulb is sold in a twin pack and efficiently provides 115 watts of light for 51 watts of power (51=100 watt). The PIAA Corporation has nearly half a century of experience in designing and manufacturing high-quality vehicle bulbs and lights.