Prometheus Alpha Ready (semi custom) and Olight M21. Both run on 18650 rechargeables. The Olight says "500 Lumens" The Prometheus says "400 lumens"
Last night, the pungent odor d' skunk awoke us to the fact that a striped friend was near. I grabbed the new-to-me Prometheus Alpha Ready and my Olight M21. Let's just say the difference was "night and day".
The Olight had a bright spot and then some level of spill but the Prometheus had a broad bright beam, which has no bright spot and just a tiny amount of spill around the main beam arc. I would estimate that the Prometheus arc of bright light was close to 40 degrees, while the bright spot of the Olight was maybe 10 or 15 degrees with the spill going out to maybe the same 40 degree arc.
The Prometheus is about twice the cost of the Olight, but the beam was absolutely in a different league.