Again, great for roundabouts and entering the flow of traffic from concealed junctions. A couple of riders reckoned they spotted the light from 350 metres along unlit roads Slow flash is similarly effective, especially along dark and lonely lanes and anecdotally, equally eye catching but the fast flash enjoys better economy. 8 hours is cited and run without the sensored technology-I’ve consistently come within eight minutes of this. 

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The fast flash’s quicker, dare I say nagging tempo left me feeling more conspicuous. Crossing A road roundabouts before ducking down a green lane, or similarly lonely B roads being prime examples. 

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Not what you’d want on a group ride obviously, unless you were doing a longer turn at the back. In misty contexts, I’ve occasionally gone over to the 200lumen warning flash- solo and sociable outings, but otherwise the 20 lumen (medium) or 5 lumens (low) are where it’s at. 

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A straw poll suggested the 20-lumen constant was visible to 100 metres on dark country roads, nearer 60-70 through town and suburbs, given the competing illumination. Anecdotally, the optical technology gave the impression it was close to some long serving 30lumen models, like for like and the 5, close to those pumping out 10. 

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The braking function obviously gives both a boost- say in slow moving traffic and encourages following riders not to get too close, potentially resulting in a touch of wheels.  

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Again, run times were faithful to those cited by Ravemen- 7hrs 11 (7 hours 30) and 25hrs 51 (26 hours) with the sensors disengaged. Much of the braking functions impact will depend on conditions-stop-go rush hour traffic and or/long climbs, trailers/tagalongs will make their mark. Ditto if you’re knackered and grinding home but as a rough n’ ready, bargain on 15% drop-in run times. 

 

Regarding these, those cited by Ravemen were performed in constant, laboratory conditions and at 25 degrees. Therefore, though lithium-Ion cells are far less sensitive to temperature variance, in my experience bitterly wintry weather (zero and lower) can knock off a few minutes.

 

Finally, the 40-lumen steady...Given the optics, 120-150 metres on country roads, 80-90 through sub/urban settings. A bit OTT, especially on a solo and if you’ve engaged the braking function. Then again, combined with the lens’ wide surface area, its assertive, rather than aggressive. Indeed, I’d probably go this route with a low-slung touring, or child trailer.