2017 Sierra with OEM HIDs... i’d say the lights are ok. They are only 25w so they are not as bright as the 35w HIDs we usually see. The high beams are kinda crappy because of that.. not enough light output! It’s a good thing the fogs are quite bright to compensate! My wife has a 2016 Hyundai Tucson with projector HIDs. MUCH better than the Sierra...