One of PIAA's number one selling light series. The compact and ultra-thin housing provides for a multitude of applications. With its 4 in. diameter the 510 Series is a natural for today's bikes. The PIAA 510 Night Tech Driving light exceeds SAE durability and corrosion standards. The compact and ultra thin housing design allows for a multitude of application. The 12 volt H3 55W=100W bulb produces a nice white light.