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.