Great information. Am considering as a bike light for use on paved roads in a primarily residential area, two and 4 lane concrete roads. Only ride in very early, dark AM, some street lights, dry conditions. Also considering the FD30 but leaning towards the FD41. Was about to buy a UC35 V2.0 until i came upon this light. I think the broader beam would be more helpful than the long beam of the UC35. I have been using a Fenix E21 for several years and it has been very good but looking for an improvement in lighting and like the Li-Ion. Any suggestion with rational for suggestion?