OSRAM Diadem Chrome PY21W (581) Indicator Bulbs


OSRAM Diadem Chrome PY21W (581) (Twin)

Why buy me?

Not only can you upgrade your headlight bulbs, you can also upgrade your signalling bulbs too. The OSRAM DIADEM range offers a series of bulbs that can be easily used instead of conventional amber signal lights. The OSRAM CHROME DIADEM bulb features a silver coloured surface which will enhance the styling of your car as the indicator bulb will match the chrome of the headlight unit.

So what are the benefits of upgrading your signalling lights? These clever OSRAM DIADEM CHROME upgrade bulbs will last twice as long in comparison to standard bulbs. The main selling point, however, is the enhanced style these bulbs offer.

The OSRAM Diadem PY21W bulbs can be used for both your front and rear indicators.  If you’re keen to invest in lighting to improve the overall aesthetics of your vehicle, we highly recommend these DIADEM signalling bulbs: if you’ve purchased new headlights it’s worthwhile upgrading your other bulb fittings too.    

Features and benefits

  • Styling enhancement
  • For use in clear lenses
  • Directly interchangeable
  • For both front and rear indicators

The technical bit

Number of bulbs: 2
Brand: OSRAM
Fitting: PY21W
Bulb type: Styling
Voltage: 12V
Wattage: 21W
Road legal: Yes
Colour temperature: n/a


Number of Bulbs2
FittingPY21W (581)
Bulb TypeStyling
Road LegalYes
Kelvin Ratingn/a
Light Improvement

Delivery Information

We aim to dispatch all orders the same/next business day. Delivery times on our standard delivery service are:

UK: 2-3 business days*
Europe: 5-7 business days*
Rest of the World: 5-10 business days*

Need your order faster?
Customers in the UK, US & Canada can also upgrade to an express delivery service. Delivery times for this service are:

UK Next Business Day (DPD): £5.49
US & Canada 2-4 Business Days (FedEx): £13.99

*average delivery times.

List Price: $20.54 USD You save $4.11 USD

$ 16.43

4.7 Based on 15 customer reviews


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Customer Reviews

OSRAM Diadem Chrome PY21W (581) (Twin)


no more orange tint bulb ,great look and Amber flashing is first class worth the money

OSRAM Diadem Chrome PY21W (581) (Twin)

5Easy upgrade

Replaced the orange front indicator bulbs on our Suzuki Swift. A simple and cheap upgrade, these Osram bulbs blend in nicely and look much better.

OSRAM Diadem Chrome PY21W (581) (Twin)

5Great website

Great website great product great customer service actual bulbs perfect

OSRAM Diadem Chrome PY21W (581) (Twin)


Excellent bulbs. Nice look to the car. Fast shipping.

OSRAM Diadem Chrome PY21W (581) (Twin)

5Excellent Customer Service

My order initially ran into an issue with the Royal Mail international shipping service - Jack from Power Bulbs tracked down the problem and helped remediate the issue. The package arrived shortly after and in perfect working order. Thanks Jack and Power Bulbs!

OSRAM Diadem Chrome PY21W (581) (Twin)

5Perfect choice

2 sets of these were the first thing I bought for my Saab 9-3. They will make a great change aesthetically to your car if it has clear glass lamp units.

OSRAM Diadem Chrome PY21W (581) (Twin)

5Chrome PY21W

These bulbs work as advertised. With the stock orange bulbs, the orange color was visible through the front clear turn signal lenses. With these Chrome bulbs, they only show orange when flashing, but are invisible when the bulbs are off. They flash just as brightly as the stock orange (non-Chrome) bulbs. Once I placed the order, it took about 10 days to get the bulbs from Powerbulbs.

OSRAM Diadem Chrome PY21W (581) (Twin)

5Perfect bulbs

Have used Power Bulbs before and would recommend them without hesitation. The bulbs arrived in a very securely packed box and the bulbs were far cheaper than other places such as Halfords.

OSRAM Diadem Chrome PY21W (581) (Twin)

5best bulbs

These osram diadem chrome indicator bulbs are brilliant and bright when signalling will purchase more of these for the rear indicators would recommend these bulbs

OSRAM Diadem Chrome PY21W (581) (Twin)

4Nice bulb

Very bright. When off it is invisible at night but a little amber in the day.

OSRAM Diadem Chrome PY21W (581) (Twin)

4Diadem Chrome

They aren't true chrome (mirror effect), like the other cheap alternative. You can see inside the bulb from the side but not from the front. They emit a very good light, bought these because I think Osram's are more durable then other cheap brands.

OSRAM Diadem Chrome PY21W (581) (Twin)

5great bulbs

the bulbs are a perfect fit. There's absolutely no amber color when light is off. Headlights look great with them.I'm going to buy another pair for my rear turn signals.

OSRAM Diadem Chrome PY21W (581) (Twin)


GReat product, fantastic service

OSRAM Diadem Chrome PY21W (581) (Twin)

3Ok but not great

Slightly disappointed in these bulbs. I remember having a set ages ago that were great but these ones still appear slightly orange and the chrome finish scratches off easily if you aren't very careful fitting the bulbs (hard on a 1 series!!) I guess it's the price you pay for road legal

OSRAM Diadem Chrome PY21W (581) (Twin)

5Osram Diadem Chrome

Great product - looks almost silver and a great amber light.

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