A quoted lumen figure is measured at the emitter for a few seconds. What matters is the beam shape on a dark road and how long it holds full output before it steps down.
01 — Weight
In grams, on a scale, with the mount included. Not the manufacturer figure.
02 — Fit
The exact standard: 31.8 mm bar, 3-bolt cage, 12 mm thru-axle.
03 — Waterproofing
The IP rating and what it means after a two-hour ride in rain.
Build the kit for the ride you keep doing.
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Lumens tell you almost nothing
Kit rated for the ride, not the catalogue.