Knog Blinder ARC 640 front light review

Trail light that's best as a secondary beam

Our rating 
3.0 out of 5 star rating 3.0
GBP £90.00 RRP | AUD $130.00 | USD $120.00
Knog's Blinder ARC 640 front light will do as your main light, but there are stronger options

Our review

Will do the job as your main light in a pinch, but best as your helmet-mounted light in our opinion
Buy if, You're in the market for a backup trail lamp
Pros: Decent battery life and beam, range of power modes
Cons: Slightly fiddly fitting and operation, outright reach is adequate rather than amazing
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With a claimed 640 lumens and four different power modes (one of which is flashing) to choose from, Knog’s Blinder ARC 640 front light certainly promises a lot.


Related: The best mountain bike lights

You’ll need the adhesive foam strip that’s included stuck on your bar before fixing the Blinder in place though, as without it, even small vibrations can upset its position. The power button used to toggle between modes is small and fiddly to use in gloves. A small indicator light changes colour as the mode changes and you’ll see a helpful, separate red warning light when power is running low.

By alternating between the three non-flashing modes, we could get a few hours out of the Blinder before seeing the warning light. On the trail and at full power, the beam spread is impressive and its reach reasonable.


Though the Blinder ARC is okay as a standalone trail light, we think its better suited to being a backup light, using the helmet mount included.

Product Specifications


Name Blinder ARC 640 front light
Brand Knog

Weight (g) 150
Dimensions 32 x 32 x 100.5mm
Position Front