That's what I do (I use it in tandem with my 15 watt halogen flood and it covers everything I need to see), and fastening is the best part. If you have a visor on your helmet it's a snap....no strapping needed. You just tuck the strap of the headlamp under the visor on both sides and it stays very secure. It also has a top strap which stabilizes it further. The other benefit of that being you can take it on and off your helmet as needed much easier. If you don't have a visor you probably would have to strap it in....when I've done that in the past I used the smaller plastic zip ties through the vents in the top of the helmet. Just make sure where the "joint" is that you have that on top of the helmet or in the vent hole itself so that it doesn't press against your melon.

BTW, the other cool thing about it is the battery pack on the back also has a red led light that blinks or solid. Not real bright, but still noticeable and doesn't require an extra set of batteries.