Philips X-tremeUltinon gen2 LED P21/5W Red (Twin)


Make huge enhancements to the style and sight of your reverse signals / stop lights with the vivid red LED light of Philips’ X-tremeUltinon gen2 range.

Why buy the Philips X-tremeUltinon gen2 Red LED P21/5W (Twin)?

The X-tremeUltinon gen2, as the name suggests, is the follow-up to Philips’ highly celebrated X-tremeUltinon range of LED bulbs. Where the range’s name has slightly changed, the purpose of the X-tremeUltinon gen2 remains the same: to provide drivers with masterfully designed LED car bulbs that provide a strong, stylish projection and long life. The X-tremeUltinon gen2, thankfully, achieves this with ease.

Achieving a vivid red light colour with an intense projection, the X-tremeUltinon gen2 allows you to signal to other drivers on the road not only more stylishly, but with heightened visibility. Avoiding the dim and ‘dotted’ effect of other (cheaply made) LED bulbs, the X-tremeUltinon gen2 range makes use of Philips’ Automotive-Grade Quality materials and expert craftsmanship to create an intense light projection with a uniform distribution.

In addition to offering huge style and performance enhancements, the Philips X-tremeUltinon gen2 boasts a resilient construction, which is highly resistant to damage from heat and shock. This durable design along with the highly efficient, low-wattage LED technology of the bulbs ensures that they last for an exceptionally long time – for up to 12 years.

(Though these LED bulbs can be fitted to any P21/5W fitting – inside or outside the vehicle – their usage in an exterior application is not road legal; such usage must be confined to off-road driving. (Additionally, they may trigger a bulb error message to appear on the vehicle's on-board computer system / dashboard. This, along with potential flickering, 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

  • Stop light bulbs
  • Intense red LED light colour
  • Tremendously long lifetime – up to 12 years
  • Improved projection, visibility and appearance
  • Enhanced durability – highly shock- and heat-resistant
  • Philips Automotive-Grade Quality standard
  • May require additional purchase/installation of CANbus adapter
  • Not road legal – intended for off-road usage 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 comes 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.


Number of Bulbs2
FittingP21/5W (380)
Bulb TypeStyling
Light Improvement
RangeX-tremeUltinon LED gen2
Kelvin Rating-
Road LegalNo
Wattage2.2 / 0.3W

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: £39.99 You save £8.50

£ 31.49

5.0 Based on 5 customer reviews


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Customer Reviews

Philips X-tremeUltinon gen2 LED P21/5W Red (Twin)

5 Shining

Talk about putting the spotlight on your product, these bulbs should be centre stage, and there name put up in bright lights.


Philips X-tremeUltinon gen2 LED P21/5W Red (Twin)

5 Excellent Upgrade

I you are reading this, then fear not. These bulbs are the best of their type. (Better than Osram equivalent too) ;) only sell the the genuine article with hologram and not cheaper copies.

By Rick Otley on

Philips X-tremeUltinon gen2 LED P21/5W Red (Twin)

5 Amazing quality

MUCH brighter than the stock incandescent bulbs and (I'm sure) much more resistant and long lasting. I had to adapt this bulb to fit my Honda Vision 110 (2019) by shaving off the outside nerves of the bulb but this wasn't the bulb's fault. The fitment on bikes and scooters is sometimes more cramped than on cars. I feel alot safer now because of the added visibility it provides on the rear. I tested one on my car and it proved to be a litle too bright for my taste, honestly. Nevertheless a fantastic buy and a great upgrade if you feel like becoming more visible.

By Andre A on

Philips X-tremeUltinon gen2 LED P21/5W Red (Twin)

5 Amazingly bright

These bulbs are expensive yes... However they are worth it for sure. Incredible build quality!No corners were cut here! You will not be disappointed!!!

By Jason Cantin on

Philips X-tremeUltinon gen2 LED P21/5W Red (Twin)

5 Perfect!!

First of all, I would like to thank you for delivering these quality bulbs that I couldn't find in my country to my door in 9 days. There is no better option in the world to turn your current car into quality LED lighting. This site is the best quality place you can get. The product brought a different air to my car, they work very well. I always want to follow up with another car behind my car. I highly recommend it, it gives you what you pay.

By A.Doganay on

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