Legal light colours in UK

[Zedlanik]

Been searching for this as far I can understand blue and red are not legal in UK 🇬🇧? As angel eyes colours or am I wrong?

[shogun]

In the UK, the law strictly limits the colour of headlights. The bulbs must either be white or yellow. That means bulbs that produce a blue light are not approved for road use. Halogen bulbs with a colour temperature over 4200K are not road legal. This is because the blue colour of the lights can confuse other drivers, who might think the blue lights belong to an emergency services vehicle. However, xenon HID bulbs that appear bluer are still legal within certain limits. Some xenon HIDs with colour temperatures of up to 6000K are considered road legal. You can use blue bulbs for off-road use. Other colours, such as green or purple, may be available but are practically guaranteed to get you pulled over.