Yes Neal you are not wrong, they have a resistor built into the plastic cover that you can remove to change the bulbs on the standard lights, they were SO easy to fit, one of the screws was slightly tucked away but you can just pull the boot liner back a little! I had them done in less than half an hour! as they are all plug and play and not needing any additional looms etc they are very straight forward, no warning lights etc and they really do look good on the car! I am made up with them! I will take some pics as soon as the Mrs comes back from a hen do with the camera!!