The GXP uses a 9011 HIR bulb. Halogen Infared Reflective Bulb. They are used by high end cars including the BMW Z-8 , Dodge Viper, Infinity 130, and the new Maximas as well. They "slipped by" DOT normal standards somehow, and are very bright. I have forgotten to dim and all but drove people into the ditch. First made by GE for SUV'* in the late 90'*, GE'* original design was fragile and they sold the license to Toshiba who redesigned it. If it isnt a OEM Toshiba, it'* an inferior clone so beware. They use same wattage as OEM and can be filed down to fit 9005/9006 bases. Nearing the brilliance of HID without the hassles, rewiring, and legalities problem. I just found out they could be modded and plan on retrofitting my Pickup with them.
Here'* a nice write up/ supplier.
HIR Headlights 9011 9012 bulbs
Standard Low***HIR Low***Standard High***HIR High
55W@12.8W ***55W@12.8W *** 65W@12.8W*** 65W@12.8W
1000****1875 ****1700 ***2500
3100K** 3600K **3250K ** 3600K