Bulbs - Plus 50 per cent
 
 
   
 The Test

You can retro-fit super-bright xenon lights to a growing number of cars, but for most of us, replacing the bulbs is the only option for improving safety as the nights get longer.

After all, equipping your Ford Focus or VW Golf with a top-of-the-range gas-discharge system could set you back well over £1,000, while a decent pair of bulbs is only around £20. As we have learned from previous headlamp bulb assessments, though, the variation in performance between best and worst is vast.

Judging by your response to past tests, night visibility is a high priority, and many of you are keen to up-grade. Yet the industry does little to help the motorist. While there's a wide range of products, they often use bewildering or misleading names. Confusion often arises over gas discharge or xenon lights, as seen on BMWs, Mercedes and Audis. These use a totally different technology from that of conventional bulbs, as the source of light is an arc burning between two electrodes in xenon gas rather than a filament. The result is a bright blue-white glow.

But manufacturers also put xenon into conventional halogen bulbs - for longevity - and claim higher performance. How many motorists have bought these, thinking they were going to get the same units as used in the BMW 7-Series?

Power claims can be misunderstood, too. The most common one is '30 per cent extra' light, but a standard 12V bulb with such a high output would be illegal. The figure refers to the amount of light on the kerb 75 metres ahead of the car - a critical point for night driving.

This stronger light is achieved by burning a smaller filament harder, to give a tighter focus to the beam. Philips and Osram make 50 per cent brighter bulbs, and some examples claim 'plus 60 per cent', although they were launched too late for this test. We assessed plus 50, plus 30 and standard bulbs - in general, expect to pay more for better performers. A further complication is blue bulbs, which aim to give a BMW or Audi look using filters or coatings to achieve the colour. These coatings actually cut light, and coloured units perform poorly. Don't confuse these with all-weather bulbs, which have a yellow beam for driving in fog.

Unlike most of our tests, you can't just pick a pack off the shelf to get the bulb we tested. Philips, Osram and GE supply car makers, and build bulbs to their customers' standards, which are higher than the law requires. Buy one of their packs and you get one of their bulbs. Others, such as Halfords, Lucas, Bosch and Hella, use suppliers, and regularly change them. The only way to ensure you get what we tested is to read the name etched on the base.

We returned to Philips' test centre in Aachen, Germany, where our last test had been carried out. All the bulbs were seasoned for an hour to settle output before power draw and light production were measured in a photometric sphere. Build quality was checked, particularly the position (geometry) of the filament and shield, as these have the biggest effect on the beam. Finally we went into the light tunnel, where the dip beam was measured for glare and light on the road. To get an overall rating, we added the light measurements for 50 metres ahead at the centre and edge of the carriageway, plus twice the 75m kerbside figure.

Where a bulb failed to produce a beam within UK legal requirements, it received only one rating or star. All our test samples were bought, to prevent 'filtering' by manufacturers, and the cost quoted is what we paid for a pair. However, price had no influence on our results, as it varied so widely among sources. The lighting tests we carried out were overseen by AA Technical Information Centre engineer Rory Stockbridge.


Osram Silverstar

Rating: 

Price: £16.37 (mail order)

Type: Plus 50 per cent

Beam: 96.9

The flagship bulb in Osram's range, the Silverstar's 75m figure was only a fraction better than that of arch-rival Philips (right), but it performed significantly better at 50m. Add a price advantage, and the Osram's plus 50 per cent competitor is our Best Buy.

Philips VisionPlus

Rating: 

Price: £19.98 (mail order)

Type: Plus 50 per cent

Beam: 95.1

It's behind Osram's finest, but Philips' top-of-the-range option is a superb bulb which performed comfortably ahead of the plus 30 per cent premium versions. You just cannot ignore that performance, which is why the VisionPlus merits our Recommended award.

   
 
Verdict
The best models in this test are plus 50 per cent bulbs. And, as their prices have dropped since they were first launched, they have become an even better prospect. In this class, Osram gets the nod over Philips.

The tables are turned in the premium plus 30 sector. These two top categories are the preserve of the original equipment producers and anything with Philips or Osram on it is a guarantee of quality. For the standard bulbs, Lucas just gets the nod over Motaquip.

As in previous tests, we have not chosen a blue bulb, as we feel these are purely fashion items which perform significantly worse than the other categories. If you must have a pair, go for the Philips or Osram - either own-brand or in a Lucas pack.

Bulbs - Plus 50 per cent


Contacts
Bosch 01895 838551
Elta 01675 466999
Halfords 08457 626625
Hella (Prolek) 0800 435488
Lucas 0800 328 9889
Motaquip 024 7688 3276
Osram 01744 812221
Peugeot (see Yellow Pages)
Philips 0115 950 6514
PIAA (Demon Tweeks) 01978 664474
Ring 0113 276 7676
Unipart 01865 778966
Vauxhall (see Yellow Pages)
White Prism 0113 276 7244

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