Originally Posted by Red__Zed

Saying "it is not illegal at all" is pretty misleading.


It does not comply with MIR rules for use in clear weather (federal law) if wired as a running light, rear position light, or switched and used in situations where it is not warranted (and this is officer's discretion, but guidelines are generally scripted around extremely heavy fog and torrential rain)


It is legal (at least federally, may vary by state), if wired as a brake light.



http://edocket.access.gpo.gov/cfr_20...cfr571.108.pdf


Of course your chances of actually getting busted are low, but that is another topic.