If you need to use tinted lenses or sunglasses when driving, it is important to know how dark you are allowed to go to drive safely and legally in the UK.
Filter Code | Light Transmission | Driving |
0 | 100 – 80% | Day or night driving |
1 | 80 – 43% | Day time driving only |
2 | 43 – 18% | Day time driving only |
3 | 18 – 8% | Day time driving only |
4 | 5 – 3% | Not for driving |
Sunglasses are typically category 2-3 with 20 or 25% transmission options. Category 4 tints are used for skiing or high altitude where UV is stronger and there is more reflected glare from snow and ice.