For night rides on my road bike, I strap my Light & Motion Urban 500 onto my helmet. The stock straps fit through the vents, no problems, no need for a special mount. Other helmets might require special mounts -- the commuter or skater type helmets with fewer vents. Road helmets are generally rated higher for safety anyway, so there isn't much advantage to the Bern type helmets.

I made a homebrewed shade for the light to minimize spill and blinding oncoming cyclists and pedestrians on the MUP. It's just an empty ibuprofen bottle of white HDPE plastic, soft and tough, easy to trim with a craft knife and scissors. It snaps into the recess just behind the lens on the L&M Urban lights -- an advantage to the cylindrical shape compared with other lights.

And I put a NiteRider Lumina Micro 750 on my road bike's head tube as the main headlight. It needs to be around 6" away from the wireless speedometer/odometer to avoid interfering. Wouldn't be a problem with wired computers.

I also use taillights on my bike and helmet. I'm a firm believer in doubling up on lights. The multiple points of light and separation give drivers a quick reference to estimate our distance, direction and speed.