Versatality vs fixed mount... https://www.foxfury.com/products/pro...bike_3watt.htm

If anybody is familiar with (my old favorite) the M6 Surefire SureFire High Power Flashlights - M6® Guardian® it puts out 500 lumens (incandescent).
Neither of the above lights are rechargeables.

Edit: This light also runs on RCR123 rechargeables with a dummy cell