In a dual intensity circuit (i.e., rear markers and brakes) if the LEDs are not pulsed at a fast enough frequency, they can create a phantom array, where ghost images of the LED Flashlights will appear if the eyes quickly scan across the array.

  White LED headlamps are starting to be used. Using LEDs has styling advantages because Cree LED Flashlights can form much thinner lights than incandescent lamps with parabolic reflectors.