OSRAM DIADEM CHROME PY21W (7507DC-02B) – Amber Chrome Turn Signal Bulbs, 12V 21W, BAU15s (Pack of 2)
The OSRAM DIADEM CHROME PY21W are indicator bulbs for turn signals with a chrome finish that blends seamlessly into headlights with clear lenses. Thanks to their state-of-the-art interference and absorption coating, the bulb appears chrome when switched off and emits amber light only when switched on , preventing unwanted color reflections in headlights and taillights. They meet the ECE PY21W standard and use a BAU15s base, with a nominal voltage of 12V , a nominal power of 21W (measured consumption approximately 25W at 13.5V), and a luminous flux of 280 lm . They are 52.6 mm long and 25.0 mm in diameter. Packaged in a double blister pack (2-pack) , they are ideal for replacing bulbs in pairs to maintain color uniformity.
Main features
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Chrome appearance when switched off; amber light only when in operation.
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ECE Category: PY21W (indicators/turn signals).
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Base (cap): BAU15s.
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Nominal voltage: 12 V.
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Nominal power: 21 W | Consumption at 13.5 V: 25 W (±6%).
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Luminous flux: 280 lm (±20%).
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Dimensions: length 52.6 mm; diameter 25.0 mm.
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Service life: B3 100 h; Tc 250 h.
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Product weight: approx. 8 g
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Sales format: pack of 2 units (double blister).
Product benefits
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Clean aesthetics in clear optics: eliminates the "fried egg" effect typical of amber bulbs visible behind clear lenses.
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Regulatory visibility: amber light in accordance with category ECE PY21W.
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Direct installation: “plug & play” replacement in BAU15s lamp holders without modifications.
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Color uniformity: sold in packs of 2 for pair replacement.
Use cases
- Front and rear turn signals with clear or transparent covers.
- Aesthetic vehicle updates that seek a discreet appearance without losing homologation.
- Preventive maintenance spares: replacement in pairs to maintain homogeneous intensity and color.
Frequently Asked Questions
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Are they road legal? Yes, they belong to the ECE PY21W category. Check that your vehicle uses this category and BAU15s socket.
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Do they fit any car? They fit BAU15s bulb holders. Check your manual to see if your turn signals are PY21W (not to be confused with P21W/BAY15s).
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Do they cause CANbus errors? Since they are filament bulbs, they don't usually generate the typical bulb failure warnings that LEDs do. Even so, the answer depends on the diagnostic system of each vehicle.
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What is the difference between 21 W and 25 W on the datasheet? 21 W is the ECE nominal power; the consumption measured at the test voltage (13.5 V) is approximately 25 W.
Installation and recommendations
Always install with the ignition off. Do not touch the lens with bare hands to avoid residue that shortens its lifespan. Replace in pairs (left and right) to maintain visual uniformity. Verify the PY21W category and BAU15s socket before purchase. After installation, check the operation of the turn signals in all positions.
Project description
Signaling lamps for turn signals, ECE PY21W , BAU15s socket; nominal voltage 12 V ; nominal power 21 W (consumption approx. 25 W at 13.5 V ); 280 lm ; dimensions 52.6 × Ø25.0 mm ; lifespan B3 100 h / Tc 250 h ; chrome finish (amber only when operating); presentation pack of 2 .
