Q:why not the some cars have canbus auto led bulb? The car light of canbus auto led bulbs sell good, 

A: canbus auto led bulb is very popular especially in the USA market But some cars don't have canbus function. Because of the limited power.auto led bulbs can not be used. Some people may ask that why add the power.Thisproblem is the heat.When the power grows to 6W, it is very good and is easy to be burn out.So the technology is still need to improve its production technology.