The P21/4W – 12V/21/4W BULB BAY15d STANDARD is a dual-filament halogen bulb offering two brightness levels: 21W for brake lights and 4W for position lights. It operates at 12V and features a Bayonet (BAY15d) base, ensuring easy and secure installation in the vehicle’s lighting system. It is ideal for applications requiring two levels of brightness, such as car lights and road safety lighting
