The OSRAM ULTRA LIFE P21/5W is a premium long-life halogen signal lamp that delivers up to triple the service life of a standard replacement bulb. Using the dual-filament P21/5W / BAY15d fitting found on the vast majority of European and Asian vehicles, it handles combined stop/tail duties with ease — offering both the bright 21W brake-light filament and the 5W running-light filament in a single, robust lamp.

Designed for drivers and fleet operators who want to reduce the hassle of frequent bulb changes, the ULTRA LIFE formula extends the filament lifespan significantly while maintaining full OEM-compatible light output.

Key Features

• Up to 3× longer life than standard halogen equivalents
• Dual-filament design: 21W stop / 5W tail in one lamp
• BAY15d offset-pin bayonet cap for correct orientation in housing
• Full OEM-compatible light output — 440 lm (21W) / 35 lm (5W)
• ECE R37 approved for road-legal use across Europe
• Fits all vehicles using the P21/5W standard, including cars, SUVs, and vans

Product Benefits

• Extended lifespan: up to 800 h on the main filament, up to 6000 h on the position filament
• Reduces roadside breakdowns caused by blown stop or tail lamps
• Ideal for fleet vehicles and high-mileage drivers
• Same brilliant white light output as standard OSRAM ORIGINAL lamps
• Trusted by professional workshops and used by OEM vehicle builders

Technical Specifications

• Bulb Type: P21/5W
• OSRAM Part Number: 7528ULT
• 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
• Lifespan: ~800 h main filament / ~6000 h position filament
• Quantity in Pack: 1
• EAN: 4008321413123

Why You'll Love It

Stop-and-tail lamps are safety-critical — a failed bulb not only risks a fine but leaves you invisible to drivers behind you. The OSRAM ULTRA LIFE P21/5W gives you peace of mind with a lifespan that far outlasts standard bulbs, so you spend more time on the road and less time in the workshop. Install once, drive confidently.