Product Specifications

The W21/5W is a dual-power multi-functional vehicle bulb with a rated voltage of 12V, featuring two power modes of 21W and 5W, and is compatible with the dedicated W3x16q dual-contact wedge base. In the model designation, "W" stands for the wide-angle lighting structure with a broad light scattering range; "21/5W" is its core identifier, corresponding to two power levels, which can switch between different circuits through the dual contacts of the base.

The W3x16q base adopts a standardized dual-contact design. Compared with single-contact bases, it can accurately distinguish between high and low power circuits, with convenient plug-and-play operation and stable connection, and is compatible with the taillight assemblies of most passenger vehicles. This bulb adopts tungsten filament lighting technology. The 21W high-power mode provides sufficient brightness, which is mostly used for brake lights or turn signals; the 5W low-power mode has lower energy consumption and can be used as the position light or the constant-on mode of taillights. The dual-purpose feature greatly simplifies the layout of vehicle lamps, making it a common core accessory for automotive rear lighting systems.