Incandescent lamps take time to light up and reach peak performance. LED lights, on the other hand, are “instantly on”. The difference is measured in fractions of a second. Under hard braking, fractions of a second matter. For example, at 100 km/h, just four tenths of a second difference in reaction time equates to an extra 11 meters of reaction distance – that’s about 2.5 car lengths of extra thinking time. With Philips LED stop lights, as soon as you decide to brake, the driver behind will know.