I know that the OP has made his move, but I'll second the Dinotte Quad Red. It's nicely made with an aluminum case and a good solid mount. Here it is on my bike:



I bought this (expensive) light to replace a Cygolite Hotshot 150, which I liked and thought was quite bright, but its battery would not hold a charge for very long. I have another copy of it that didn't have that problem.

I compared the Quad to the Hotshot. At about a hundred feet, the Quad was more visible, due to its four red LEDs that made a larger spot to see; the Hotshot was quite bright, but showed as more of a pinpoint. I think the Quad would be more visible at a greater distance.

My experience with the Quad is that it lasts more than four hours but less than five at its brightest strobe setting, and that the times noted at the link above are incorrect. The times on this instruction sheet are probably more realistic. I recharge it after four hours with a provided USB C cable.

The mount is quite good too. The light comes with three mounts for a seat post, and mounts for seat stays and aero posts and tubes are available. It has good adjustability, and I can't imagine it coming off its mount:


Dinotte Quad Red mount on seat stay

After trying out the Quad, I bought the Quad Amber, a front headlight. Very nice! I like the form factor more than the flashlight-style Cygolite Metro it replaced.


Dinotte Quad Amber front light