You have a much greater need on a bike to see road detail, you need to look out for potholes and sticks on the road. In a car, you just need to be able to see the road lines and reflect light off of signs.
I use a 1200 lumen bike light, powered by two 3500mah 18650s.
That's great for you, now imagine the guy coming the opposite direction being blasted with 1200 lumen in the eyes. Sure you made him aware of your presence but you also made him blind to any other stuff or people besides you.
But cyclists tend to get a pass with almost everything for some reason.