We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
OSRAM 7528 automotive bulb clear glass metal base

OSRAM

OSRAM 7528 P21/5W 12V BAY15d standard bulb

SKU CH-CHVS-4P5HX

A 12 V dual-filament automotive bulb with BAY15d base delivering 440 lumens at 2800 K for brake and tail-light use

  • TypeAutomotive Bulbs
  • Lumen Range440
  • Wattage21
  • Color Temperature2800K
  • Bright dual-filament output at 440 lumens
  • Warm 2800K colour temperature for clear signalling
  • 12 V / 21 W rating matches vehicle electrics
  • BAY15d base fits standard tail-light sockets
  • OEM-grade construction for reliable replacement

12V BAY15d Automotive Signal Bulb

The OSRAM 7528 is a 12-volt P21/5W dual-filament lamp built for exterior signalling on cars and light commercial vehicles. It fits the standard BAY15d bayonet base found in many stop, tail and direction-indicator housings. The bulb delivers 440 lumens at a warm 2800K colour temperature.

Drivers needing a direct OEM replacement

This bulb suits owners who want a like-for-like swap that matches the original equipment specification. It is not intended for buyers seeking higher-output upgrades, LED conversions or lamps for headlamp main-beam applications.

Dual 21/5 watt filament rating

The single figure that decides fitment is the combined 21-watt bright filament and 5-watt dim filament rating. Your vehicle’s lamp holder and wiring must be rated for this exact wattage split; otherwise the bulb will not function correctly or may damage the circuit.

Highlights

  • Bright dual-filament output at 440 lumens
  • Warm 2800K colour temperature for clear signalling
  • 12 V / 21 W rating matches vehicle electrics
  • BAY15d base fits standard tail-light sockets
  • OEM-grade construction for reliable replacement

Specifications

BrandOSRAM
TypeAutomotive Bulbs
Lumen Range440
Wattage21
Color Temperature2800K

Questions about this item

Does the OSRAM 7528 P21/5W 12V BAY15d bulb come as a single unit or a pair?

The OSRAM 7528 is supplied as a single bulb. No additional components are required for installation if the vehicle uses a BAY15d socket and a 12 V system.

Should I choose the 21 W version or the 5 W version for my brake and tail lights?

This dual-filament bulb provides both outputs in one unit: the 21 W filament for brake lights and the 5 W filament for tail lights, so no separate version choice is needed.

How bright is 440 lumens at 2800 K in a real tail-light housing?

The 440 lumen output at 2800 K delivers a warm white light that meets standard signalling requirements for stop and tail functions in compatible 12 V housings.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.