Honestly, this light is insufficient to see it properly by bike, not powerful enough. I had to buy another more powerful and in my opinion it takes at least a brightness of 1500 lumens for comfortable ride in town. The plastic mounting kit that will held 3 weeks prior to break, cold with hardened plastic. Otherwise remains the lamp itself works well and is well made of aluminum, light and I appreciate the zoom. Finally, I would at least buy a good flashlight :-)