THE REAL REASON IS THAT LED LIGHTS KA RESPOSE TIME IS INSTANTANIOUS ,NORMAL BULBS TAKE A FEW MILISECONDS TO REACH THE PEAK ..LED DOES IT INTANTNIOUSLY,,SO AT A SPEED OF 100 IT SAVES THE DRIVER BEHIND U ABT HALF A METER BECAUSE HE SEES THE LIGHT JUST A FEW MILISECOND EARLY,,,,,,,,,