Again the DOT approval is for the lens design, not what's lighting it up from behind. The exception is headlights, driving / fog lamps, or aftermarket trailer light lenses. What lights up stock factory lenses up from behind is not DOT required. Many modern vehicles use LED lamps for illumination. The DOT number is for the lens design along with the reflectors. Have you ever seen a DOT approval number on any 1157 or an 1157A bulb? Just sayin.
