Where to start? ... Ok well first the lights come with no installation instructions (that are helpful anyway) the ones in the box are for installing the lights on a 2000's Chevy Silverado which has 2 separate light assemblies. If I did not have an electronics background and a wiring diagram for the Impala I would not have been able to get the LEDs and the halos working.Ok so i can hear the comments now "the lack of instructions is bad but 1 star?" Ok well the worst thing about these headlights is well the headlights. The lights are so dim it's almost a hazard. Even after adjusting the aim (which I will get to) the low beams are not much brighter than park lights and the high beams are not much better.I feel I should also mention that it is stupid hard to aim these headlights the screws are located in such way that you need to remove the whole light I'm going to repeat that you have to remove the light in order to aim them. So you get your mark on a wall remove the lights turn the screw a bit put the lights back check them and repeat. Why don't they just keep the one screw system the GM used on the stock lights?So all in all the lights are not worth the $200+ they cost, don't get me wrong they look sharp but that's all.