Some helmets don't require any additional adapters and straps to fit the light. The Bell Sweep is a fine example because it has a horizontal rib running though the center vent that will position a light with the correct loft for riding. All you need to do is wrap the o-ring from the light around the center rib of the helmet and route the wire through the helmet to the battery. Using whatever method works for you, stow the battery off the helmet. I just use the standard Magicshine style light with the updated XM-L T6 emitter and stow the battery in a camelbak. At 10 bucks for the whole shabang, what else do you need? The light itself only weighs 112 grams, about the weight of an iphone 5S.