The bulbs we sell are Canbus style so they work perfectly with the RCZ's electrical system. With 36 lumens they are very bright, any brighter and you might not read the plate well and that might be something the police would pull you over for, but not up to me on that and so don't take my word for it, just wanting to sell what I believe are the best for the RCZ after researching. They consist of 5 LED's. As for road legal, they are not E approved but lets face it, with new cars that have LED bulbs from the factory all over the place, these upgrade bulbs are no brighter than those. I too have not found any 501 bulbs that are E approved that are Canbus.