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BRIGHT RELIABLE LIGHTING – These 535 H21W halogen bulbs deliver strong, consistent illumination for side lights and tail lights, ensuring your lorry remains clearly visible to other road users in all driving conditions while maintaining stable light output and dependable performance. DESIGNED FOR 24V COMMERCIAL VEHICLES – Engineered specifically for trucks, lorries, buses, and other 24V systems, these bulbs offer compatibility with a wide range of commercial lighting units, making them suitable for professional fleet maintenance and heavy-duty usage. DIRECT BAY9S REPLACEMENT – Manufactured in the BAY9S 433E format, each bulb provides a secure, precise fit and installs quickly with no modifications required, making it ideal for restoring brightness when existing bulbs become dim, flicker, or fail entirely. DURABLE HALOGEN BUILD – Constructed to withstand vibration, heat, and continuous use common in commercial vehicles, these bulbs offer long-lasting reliability, helping maintain consistent lighting performance on long routes, heavy loads, and frequent stop-start driving. VALUE PACK OF 10 – Supplied as a cost-effective pack of 10, this set allows you to refresh multiple lights across your vehicle or fleet and keep reliable spares on hand, ensuring that essential safety lighting remains visible, compliant, and ready for immediate replacement when needed.