OSRAM Diadem Chrome PY21W (581) Indicator Bulbs


OSRAM Diadem Chrome PY21W (581) (Twin)

4.6 Based on 11 customer reviews - Write a Review

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

Delivery Information

We aim to dispatch all orders the same/next business day. Delivery times on our FREE 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.

RRP: £14.99 You save £3.00

£ 11.99 incl. FREE delivery

In stock

Order in the next 8 hours 1 minute for dispatch today

Write a Review

Customer Reviews

OSRAM Diadem Chrome PY21W (581) (Twin)

5 Excellent 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!

By Chris on

OSRAM Diadem Chrome PY21W (581) (Twin)

5 Perfect 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.

By DS on

OSRAM Diadem Chrome PY21W (581) (Twin)

5 Chrome 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.

By Matt N on

OSRAM Diadem Chrome PY21W (581) (Twin)

5 Perfect 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.

By Stephen Pawlak on

OSRAM Diadem Chrome PY21W (581) (Twin)

5 best 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

By Thomas Lee on

OSRAM Diadem Chrome PY21W (581) (Twin)

4 Nice bulb

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

By Jian on

OSRAM Diadem Chrome PY21W (581) (Twin)

4 Diadem 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.

By Bjorn on

OSRAM Diadem Chrome PY21W (581) (Twin)

5 great 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.

By Nipsy on

OSRAM Diadem Chrome PY21W (581) (Twin)

5 Bulbs

GReat product, fantastic service

By R Murphy on

OSRAM Diadem Chrome PY21W (581) (Twin)

3 Ok 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

By Mbarned on

OSRAM Diadem Chrome PY21W (581) (Twin)

5 Osram Diadem Chrome

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

By Bob G on

Load more
Show less