Headlight Bulbs Tested - Auto Express

Auto Express have published their review of thirty headlight bulbs. 'At the heart of this test is the amount of light a bulb puts on the road. So, we adjusted each product in a BMW 1-Series headlamp until the glare was within legal limits. We then measured the light at 50 metres on the kerb and in the centre of the road, plus at 75 metres. To get our beam rating, we used an industry formula, adding the 50-metre readings and doubling the 75-metre figure - where light is needed most. We took an average from our two bulbs; the higher the rating the better.'