In most states those are actually illegal to turn on when driving on a street or highway. Source: owned a 4x4 for off-roading that had a bunch of KC lights on top. I was advised by the installer to keep the covers on them because it's illegal to have them on the street in an uncovered state. Other source: got pulled over for something, and the cop let me go because someone drove by in what looked like a UFO landing sight.