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@Nim
^^ The On-one / Px lights (Phaart Bleep) are not quite the same as the RSP Astrum. I own both lights and the On-one is noticeably less bright than the RSP side-by-side. Also the mounts although very similar are not interchangeable.
The On-one is still a great light, currently using it on the commute and it gets the "What is that light?" question from other riders as often as the RSP does.