http://www.ec21.com/ec-market/x511.html http://anita11.en.ec21.com/H2_H3_Automobile_Light--3033441_3033486.html100W Variety of lampholder available: X511,PK22s,H3C Suitable for headlamp, fog lamp, and other vehicle lightings 20080912 http://gsbconamlight.en.ec21.com/Automotive_Halogen_Lamp--85328_3508210.html Part No. Type Volt (V) Watt (W) Lumen (Lm) Life (Hrs) Base 21055 H2 12 55 1550 500 X511 21100 H220080521 http://ddsuper.en.ec21.com/Automotive_Halogen_Lamp--642727_642821.html12V H2 55W 1800Lm 200Hrs X511(base) 12V H2 100W 2500Lm 100Hrs X511(base) 24V H2 70W 2200Lm 150Hrs X511(base)20060207