Philips X-tremeUltinon LED W21W 6000K Car Reverse Signal Exterior Bulb (Single)


Philips X-tremeUltinon LED W21W 6000K (Single)


Put style and safety on your side with the new X-tremeUltinon LED W21W from Philips.

Why buy Philips X-tremeUltinon LED W21W 6000K (Single)?

For a simple, effective means of boosting the style and safety of your vehicle, the Philips X-tremeUltinon LED W21W is definitely worth trying. After a simple plug-and-play installation, you’ll see an immediate improvement to your vehicle’s sight and style thanks to the bulb’s intense 6000K colour temperature. Whatever light improvement you’re hoping to effect by upgrading, whether you're wanting vibrant amber turning signals, a vivid red stoplight or a crisp, bright white reverse light, the Philips XtremeUltinon range delivers.

The brighter light of the Philips X-tremeUltinon not only enhances the style of your vehicle; it also boosts your visibility to others and illuminates more of the road. As such, you can drive more safely and look better while you’re at it. And with an incredible lifespan of up to 12 years – reinforced by a durable, heat- and vibration-resistant design – you can enjoy all the features of the X-tremeUltinon W21W for longer.

(The usage of these bulbs in an exterior application is not road-legal and, in addition, may trigger a bulb error message to appear on the vehicle's on-board computer system / dashboard. This is a harmless side-effect owing to the difference between halogen and LED technology. Any such warning errors may be removed with the additional installation of a CANbus control unit.)

Features and benefits

  • 6000K LED lighting
  • Exceptionally long life – up to 12 years
  • Improves lighting, safety and style
  • Daylight effect
  • Durable design
  • Innovative casing prevents heat and vibrational damage
  • Built to Philips Automotive-Grade Quality high production standards
  • Not road legal – off-road applications only

About Philips

For over a century, Philips have been literally making the world a brighter place. Through using ever-advancing technology and adhering to the most rigorous and superlative of production standards, it isn’t hard to see why one in every three cars worldwide come equipped with Philips lamps. A purchase from Philips not only offers best-in-class technology, but peace of mind.

 It is your own responsibility to ensure that the use of the LED retrofit lights complies with applicable local legal requirements.


FittingW21W (286)
Number of Bulbs1
Bulb TypeStyling
Kelvin Rating6000K
Road LegalNo
RangeX-tremeUltinon LED
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.

RRP: £24.99 You save £6.00

£ 18.99

4.0 Based on 1 customer review


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Customer Reviews

Philips X-tremeUltinon LED W21W 6000K (Single)

4Satisfied after almost 4weeks waiting

The bulbs really change the looks of my car since it’s become the DRL. Just simply plug and play. Bought on 24th Sept and received it on 18th Oct.

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