Minoura's Bésso LH50 fork mount clamps to either side of your front fork, provides a good spot to mount your headlight.
Mounting your headlight well below eye level helps you see potholes and other road hazards, because they'll cast visible shadows.
It can also be used to attach various accessories to your handlebar, stem or frame tubes.
Adjustable metal clamp band fits around things from 19-35 mm (3/4" to 1 3/8") in diameter.
Not recommended for carbon forks.