This 4” round light has a superior design using a sonic welded lens to prevent moisture, dirt and dust from penetrating the light. The black housing has a clear lens opening at the bottom of the light and uses white LEDs to shine down and illuminate your license plate or bus number while at the same time red LEDs illuminate through the red lens to provide a strong stop, tail and turn signal. Stop/Tail/Turn light passes SAE J1398, J1395, J585, DOT, FMVSS 108 & CMVSS specifications. License Plate light passes SAE J587, FMVSS 108 & CMVSS specifications.