The Philips LED CAN bus Adapter can be used for interior and/or exterior applications, including Amber, Red and White LEDs - For vehicles requiring a Can-bus warning canceller - For use with interior and exterior LED applications (other than headlights and foglight) LED upgrade lights are great. They’re rugged, they last far longer than conventional bulbs, and they offer brilliant illumination. But in some vehicles, they can also trigger a false bulb failure warning. Avoid false bulb failure warnings by installing the Philips LED CANbus Adapter. Some cars use the vehicle’s computer network (CANbus) system to verify the functioning of the vehicle’s lights. Because LED bulbs have a lower wattage and draw much less power than conventional bulbs, when the system runs a check, the electrical resistance of an LED may be too low to be detected. This creates a false warning that one of the lights has failed. Philips LED CANbus Adapters help prevent false bulb failure warnings. In addition, a lot of auto manufacturers use PWM (or pulse width modulation) to precisely control the voltage to a bulb. One of the benefits of doing this is to improve bulb life. These quick, voltage pulses (PWM) do not give a bulb filament time to cool down and dim, so for halogen bulbs the pulses are not noticeable. However, with an LED bulb, these pulses are enough to turn the LEDs off and on very quickly, which results in a flashing of the light. Philips CANbus adapters eliminate any issues introduced when installing an LED in place of a halogen bulb. Installation of the adapters takes just minutes.