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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

  • Power rating21
  • Light output440
  • Color temperature2800K
  • Product typeAutomotive Bulbs
  • 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.

How it compares

Measured against everything we stock in General-Purpose & Specialty Bulbs, at today’s prices. Recalculated every night.

Price $3.99
Cheaper than about 94% of the 1,791 comparable items (median $17.99).

Specifications

Product
Brand nameOSRAM
Product typeAutomotive Bulbs
Display
Light output440
Power
Power rating21
More details
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.

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