The 360 series LED bulbs consist of 5mm LED's that use the factory housing the same way a standard halogen bulb would, with a typical LED bulb having 28 of these LEDs. The benefit with LED is ten time less power consumption and instant on. Bulbs are designed to fit turn signals, brake lights, reverse indicators, dome lights, and any other standard light receptacle, with the exception of the headlights. Due to the increased efficiency of LED bulbs over halogen bulbs, your vehicle may have faster blinking that factory, because the vehicle doesn't get the halogen amperage draw. To resolve this, Vision X has introduced the HIL-Resistor which is sold separately, which increases the resistance and eliminates any fast blinking or bulb out indicators.