Outbound Lighting Trail Evo + Hangover and Trail Evo + Exposure Lights Diablo. Thanks to a suggestion from Kailen, turning the GoPro Helmet Strap Mount 90 degrees helped to secure it in place on the helmet. The only problem is I had to use an elbow to turn the light back 90 degrees which makes it sit pretty tall. You can feel the weight of it more and it's not great for low hanging branches. So I don't love the spotlight quality of the Hangover on the road but it does work well on the trail for throwing light off into the distance where that spotlight has had a chance to spread and doesn't feel so confined. The pattern isn't as good for close distance. The Diablo is better at throwing a lot of light evenly over a wide area nearby. The con is you don't get the same long distance illumination. What this probably means is I need to get a new helmet that will work with the GoPro Adhesive mount so I don't look like I'm riding around with a camera flash on my helmet. :)