Mini review:
Overall, its a very nice bike light for the price. The emitter appears to be 4K tint, which is a bit on the yellow side for my liking while on the move. But that’s just a personal preference. 5K-6K provides better contrast to visually identify targets and terrain, and I find the differences in perception to be quite noticeable while at speed. The beam cut-off and oval beam pattern is perfect for urban riders wishing to avoid blinding oncoming traffic and I highly recommend it. An additional benefit of the wide beam pattern is that is offers adequate side illumination to hopefully grab the attention of inattentive traffic. The visual difference between high and turbo modes are negligible, so I run mine in high mode. Turbo mode generates a lot more heat while greatly reducing run-time. The battery is supported by a spring to each end, which kept the cell firmly in contact while traversing rough terrain. This kept the light from flickering and changing modes under extreme vibration/high G impact loads.
For areas without traffic, a C8 or similar offers better throw and a narrower beam with marginal spill for side illumination. For redundancy and to become more conspicuous, I always travel with 2 lights on my handlebars. IMO, this B01 along with a C8 is the perfect versatile budget light combination for bicycling.
BTW, my main bike light is a modified SRK (3 x XM-L2 @5A to each emitter), with a DIY remote cell pack using 12P x 18650 cells. Once heated up, I get about 3600 continuous lumens. But I still keep a secondary light illuminated for when the SRK goes down. It doesn’t happen often. But when it does, its always at the worst possible moment!