michigan the "bulbs" cannot be visible, your not suppose to drive with them on, only one juristiction will ticket you for it, the others we fight the law as "no light is on, it is a glass, tube filled with gas, a small current of electricity excites particals of matter and makes the electrons jump up an energy level giving off a haze"... keep away from blue, and red, not that they are bad colors, but here, either of those two while driven can get your vehical impounded because blue and red lights are ment for emergency vehicals only, if you have just red youll be fine, but dont go fot the cop car look/effect