PIAA 19616 9006 (HB4) Xtreme White Plus High Performance Halogen Bulb, (Pack of 2) 4000k Bright White Color for Visibility and Style Heat Resistant Quartz Glass for Long Life XTRA Technology for Increased Light Output Aerospace Alloy Filaments for Durability Select DOT / SAE Compliance for Street Legality Intense white light, 4000K rating, with blue tint 51=115 watt (provides 115 watts of light using 51 watts of power) Designed with high-quality heat-resistant tube Manufactured to SAE recommended specifications and DOT compliant Twin pack