The OSRAM ORIGINAL METAL BASE P21/5W is a dual-filament halogen signal lamp manufactured to OEM quality, designed as a precise like-for-like replacement for any vehicle using the P21/5W / BAY15d fitting. The dual filaments make it the workhorse of combined stop/tail lamp assemblies — the 21W filament delivers a bright brake-light flash, while the always-on 5W filament provides the rear position light.

OSRAM's robust metal base construction ensures a vibration-resistant, corrosion-proof bayonet connection that stays secure for years, making this bulb the preferred choice of workshops and fleet operators who demand dependability above all else.

Key Features

• Dual-filament design: 21W stop / 5W tail in one lamp
• OEM-quality replacement matching original factory specifications
• BAY15d offset-pin bayonet cap ensures correct orientation in housing
• Robust metal base for a vibration-resistant, corrosion-proof fit
• ECE R37 approved for road-legal use across Europe
• Universal P21/5W fitment — compatible with a huge range of vehicles

Product Benefits

• 440 lm (21W filament) / 35 lm (5W filament) — clear, OEM-level output
• Metal base reduces the risk of loosening over time versus all-plastic caps
• Tested to OSRAM's rigorous quality and durability standards
• Trusted by professional workshops and OEM vehicle manufacturers worldwide
• Cost-effective replacement for one of the most common stop/tail fitments

Technical Specifications

• Bulb Type: P21/5W
• OSRAM Part Number: 7528
• Voltage: 12 V
• Wattage: 21/5 W (dual filament)
• Luminous Flux: 440 lm (21W filament) / 35 lm (5W filament)
• Base / Cap: BAY15d (dual contact, offset pin)
• Colour: White / Clear
• Length: 52.5 mm
• Diameter: 26.5 mm
• Lifespan: ~290 h main / ~4000 h position filament (Tc)
• Quantity in Pack: 1
• EAN: 4050300891477

Why You'll Love It

A failed stop/tail lamp is not just an inconvenience — it is a safety risk and a legal issue. The OSRAM ORIGINAL METAL BASE P21/5W gives you an instant, dependable fix: OEM-precision in a robust metal-base package that fits your existing housing perfectly and gets your lighting back to full spec in minutes.