The National Highway Traffic Safety Administration (NHTSA) has established regulations that outlaw replaceable-bulb LED headlights. However, the enforcement of these laws falls under state jurisdiction.
States tend to prioritize more significant concerns than the modification of vehicle headlights, which may lead to a lack of enforcement in this area.
As a result, while the NHTSA's regulations exist, individuals may still choose to install these headlights without facing federal repercussions.