The SDB-190HB uses a free curve reflector. A free curve reflector is very efficient because it uses the whole reflector. This allows the spot beam to illuminate approximately 235 meters ahead and the driving beam to illuminate the entire surface in front of the vehicle. The lens of the SDB-160HB is protected by a stone guard in a "V" shape to let air cool the lens surface, allowing extended operation of the lamp. Hardened glass lens has excellent heat and thermal shock resistance, strength and translucency.