HID headlamps are at least 50% brighter than traditional halogen headlights and tend to be found on higher-end cars.
The headlamps - called HIDs and commonly referred to as bi-xenon - are much brighter than traditional headlights and are sold as a safety feature.
But some road-users claim they are often dazzled by the lights, making pedestrians and cyclists difficult to see.
And that's a view backed by some eye experts, including Geoffrey Roberson from the Association of Optometrists.
The man behind a campaign trying to get the lights better regulated is Ken Perham.