I am still more than satisfied with two Fenix LD20 (dual AA cell) mounted under bars with twofish blocks for night rides. I usually use one at a time, but can turn both on for more light. I use an L1D (single AA cell) for my commute. Never dropped one.

Interestingly my friends who use proper bike lights have dropped theirs and/or have used duct tape to secure the weak clamps.