Well, I have elaborated more that LED headlights are legal, but they differ. The most important thing is to consider the standards set by the Department of Transport in the United States. Coupled with the DOT or the SAE. If you have bought and installed LED headlights that are not approved by any of these bodies, it may be considered illegal. Usually, the light bulbs should have a sign printed which indicates DOT approval. When stopped by traffic officers, they will check that as well. This is not an issue to overlook. If, for instance, you get involved in an accident, you may be sued for an exorbitant amount of money if they realize you’ve actually installed illegal LED headlights. Important: SAE approval alone is insufficient. DOT approval is more important. Every region may have different standards so you have to check that as well. With regard to xenon headlights, they’re illegal. They do not meet the standards set by the DOT even though they are more powerful. You can use them in off-road applications.