Can I have custom LED lights, ambient lights, or neon lights in my car?

The short answer is: Interior LED lights/ambient lighting: generally yes, provided they don't dazzle, distract, interfere with driving, and aren't mistaken for exterior lighting. Exterior neon/LED lights (underbody, side, bodywork, etc.): in practice, not for driving on public roads, because the regulations limit the permitted lights and prohibit […]