why some cars don't have the canbus fuction?

The led canbus light sells so well,why some cars don't have the canbus fuction?

Q:The led canbus light sells so well,why some cars don't have the canbus fuction?

A:led canbus light is very popular especially in the Germany market But some cars don't have canbus function. That is because of the limited power.Some people may ask that why not to add the power.The problem is the heat.When the power grows to 3W,it is very heat and is easy to be burn out.So the technology is still need improving.

led canbus lights