566 (P21/4W)

566 (P21/4W) LED Bayonet Bulbs – Dual Filament Upgrade

Browse our selection of 566 (P21/4W) LED bayonet bulbs, the perfect high-performance upgrade for your vehicle’s brake and tail light applications. Designed to replace standard dual-filament halogen bulbs, these LEDs provide faster response times, brighter output, and improved energy efficiency — all while maintaining compatibility with most vehicle Canbus systems.

Featuring a BAY15D (dual-contact, offset pin) base, 566 LED bulbs are commonly used for rear combination lights, where one filament operates as a tail light and the other as a brake or stop light. With 6500K white or red LED options, they deliver clear, attention-grabbing illumination while reducing heat and power draw.

Each bulb is built with long-life LED chipsets, housed in durable, vibration-resistant casings. Plug & play installation means no wiring changes or modifications — just a simple, modern upgrade to improve both style and safety.

Ideal for cars, vans, and motorcycles requiring P21/4W or 566 bulb types, these LED replacements offer a smart solution for enhanced rear-end visibility on today’s roads.