What is the difference between with and without a lens?

[MartinLee]

There are several differences between having a lens and not having one: 1. A lens can focus the car's light, ensuring optimal illumination when the light shines on the road. 2. Without a lens, the car's light effect will be scattered, producing glare that can impair the vision and safety of oncoming drivers. 3. Under the same lighting conditions, a light source with a lens is 3-5 times stronger in terms of distance, width, and brightness compared to one without a lens. Having a lens enhances safety during nighttime driving.