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I've had these lights for a month or so now. During this period, I've cycled every day, and have been "fortunate" enough to enjoy nearly all of the weather extremes that England can offer.
Through storms and sunshine, drizzle and damp, winds and wilds, these lights have travelled, and as of today, they continue to function beautifully.
They are bright, funky looking, and flexible, and I thoroughly recommend them, with one key stipulation.
These lights are not bright enough to use as the primary sources of light on your bike, and they are definitely not bright enough to see by.
I have bought two sets of them, and I have affixed both to my helmet. Thanks to their soft elasticated design, it was easy to position them in such a way that should I ever be unfortunate enough to have a serious accident, they should not overly inhibit my helmet's ability to "skid", or "roll", thus reducing impact forces, and protecting my head. This is something that had always prevented me from buying helmet lights, camera's, and the like before. An massive added bonus to this approach, is that two sets of these Knog lights set me back less than £20, and (the way I have positioned them) enhance my all round visibility to oncoming traffic, many helmet lights/mounts cost considerably more than this, and are not particularly visible from the sides.
In terms of features, the lights do not require a mount, but use an attached elastic loop, which curls around your preferred bar/strut, and attaches to a plastic hook on the under -side of the light. It's a clever and flexible system, and the elasticised loops were strong enough to resist a clumsy yanking from my bear-like paws. The lights have proven to be water resistant, and have survived a fair portion of heavy driving rain, they also have a few modes, a slow blink, fast blink, and solid beam. The button to switch the modes is activated by squeezing the central body of the knog, and is easy to use with thick gloves. A long press, or cycling all the way through the 3 options can turn the light off.
Great ancillary lights then, deserving of a 5 star review. Additionally, whilst not really ideal for usage as main lights, I would rather think of someone on a limited budget, or a child, using these lights, than nothing at all, and given the low entry price, I suspect that for some people, it will be these or nothing.
As a final note, when considering buying batteries for these, have a look on Ebay & Amazon, high-street rates can be slashed substantially without sacrificing quality or brand.
"Knog Frog Strobe Set. Lights - Sets F&R. Features: •Water-resistant •Flexible silicon body •Integrated clipping feature •Quick-release mounting •Visible up to 600 metres •Burn time: 80 hrs (steady), 50 hrs (flashing) •Safety light only"