The Diamond Helmet Light is the perfect complement to many Bern helmets (Excluding the Major, Watts 2.0, Hudson, Tigre). Designed to provide increased visibility to riders of all kinds, this water resistant. tail light boasts 3 high power light modes and up to 11 hours of runtime at 6.6 lumens. Plus, its intuitive mounting system allows you to upgrade your visibility in seconds. Stay stylish and stay seen with Bern's Diamond Helmet Light.