Knog Blinder ARC 640 review

The Knog Blinder ARC 640 is a sleek front light, but can its function match its form?

Cycling Weekly Verdict

The Knog Blinder ARC 640 is a good front light which is bright enough to be used in some pretty gloomy conditions, and is also very easy to use. However the mount isn't secure enough to keep it pointing in the right decision, which is a major flaw.

Reasons to buy
  • +

    Sleek design

  • +

    Integrated mount

  • +

    Easy to use

  • +

    Fairly bright

Reasons to avoid
  • -

    Mount could be more secure

  • -

    Integrated charger is fiddly

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

Compared to many other front lights that cost less than £100, the Knog Blinder ARC 640 has a very sleek design. The mount is permanently attached to the bottom of the light body, meaning there’s no chance of accidentally losing one or the other. However I found that the mount wasn’t very secure, and on bumpy roads it would often rotate backwards, meaning it was pointing skywards rather than at the road - not on potholed tarmac where I needed to exactly what the roads had in store for me.

>>> Best front lights for under £100

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Henry Robertshaw began his time at Cycling Weekly working with the tech team, writing reviews, buying guides and appearing in videos advising on how to dress for the seasons. He later moved over to the news team, where his work focused on the professional peloton as well as legislation and provision for cycling. He's since moved his career in a new direction, with a role at the Department for Environment, Food and Rural Affairs.