The Eiko A-3603 is a double-filament headlight for motorcycles and snowmobiles. This 25/25-watt bulb has an average lifespan of 100 hours for each filament and shines at 453 lumens per C-2V filament. The bulb is a standard T-6 shape and is mounted on a double contact flanged base (PX15d). The double contact base makes it easy to replace your current headlights with this new bulb. The 100 hour lifespan means that this bulb will last many miles before seeing any substantial reduction in lumen output.