I own a Hyundai coupe . The headlights are H1 bulb fitting , i have tried many bulbs to improve performance but the Philips X-Treme are in a totally different league .
The light given off is so good that i had to adjust the beam to a lower setting ( via the beam dial control on the dashboard ) for town use .
In country lanes i could see really well without main beam and earned a little more respect for car`s design .
i would urge anyone with H1 to fit these as a upgrade , superb