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Knog Booomer LED Lights



Good all-purpose town lights with a high output and smart design but need to be handled with a bit of care

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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A bit of a mixed bag, the Boomer. On the one hand it's a super bright little light that's simple to fit and gives good all round visibility. On the other it's hampered by a fiddly switch which is also prone to turning the lights on in your bag, and you have to be careful with the mount to keep them properly weather sealed.

The front and rear Boomers are different shapes but the same basic construction, a plastic insert (holding the electronics and two AAA batteries) with a silicon rubber outer that also doubles as the mount. Stick one in the other correctly and it's pretty watertight (especially if you add a touch of silicone grease); get it even slightly wrong – quite easy to do – and it leaves channels for the weather to get in. I've had no water ingress in mine, despite some filthy conditions, but you do need to be careful; there's plenty of reports of Boomers letting in the rain if you dig about online.

The mount is a silicon strap that goes round the bars and seatpost respectively, and it's simple and secure. Both lights have a number of flashing modes and a constant one, and the stated outputs of 50 lumens (front) and 30 lumens (rear) are high for lights of this kind. The rear is on a par with units like the Niterider Cherry Bomb and Smart Superflash, the front is great around town and just (just!) enough for an excursion onto unlit lanes, although the light leaking from the top of the unit can be a bit distracting. Side visibility is also very good on both lights, especially the rear. Battery life isn't great on constant – just a few hours – but these lights are better as flashers, and set to flashing you'll get plenty of run time.

What isn't good is the switch. It's pretty vague underneath that rubber casing and hard to use with gloves. My front light was prone to switching modes when given an accidental knock, but this is a known issue with some of the lights ( and would be a simple warranty replacement. Both lights, however, were susceptible to being turned on accidentally when languishing in the bottom of my rucksack because of the positioning and light action of the switch. If you hold the switch down in any mode it'll turn the light off, which is a nice touch, but I'd like the click to be much more positive.

Everything about the Boomer's design suggests that you'd take them off and sling them in your bag. If you do, you'll need to check you haven't accidentally switched them on, and when you fit them you also need to make sure the silicone case is properly in position. Provided you can commit to that, they're bright and funky.

The Boomers are available as individual lights or as part a set as tested here, as you'd expect they are also available in a range of colours too.


Good all-purpose town lights with a high output and smart design, but need to be handled with a bit of care. test report

Make and model: Knog Booomer LED Lights

Size tested: n/a

Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

I was lucky enough to be in Boomer's frickin' sweet frat-pack for spring break in Cancun last year. Not only did the little dude score the most beads on the party-porch (for his frickin' sweet strobe flash!) but he can drink harder than our quarterback…which is saying something frickin' sweet!

Boomer rear is Boomer front's charming younger brother. He is loyal, passionate and more considerate than his brother, preferring not to take unnecessary issue with trivial arguments. Probably the only thing they have in common is their admirable commitment to safety.

Water-resistant, superslim, flexible silicone body, integrated lens, hold button down to 'off' in any mode.

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Rate the product for performance:
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Rate the product for value:

Did you enjoy using the product? Good lights but you need to take care with them

Would you consider buying the product? Probably not

Would you recommend the product to a friend? Probably not

Overall rating: 6/10

About the tester

Age: 37  Height: 190cm  Weight: 96kg

I usually ride: whatever I\\\'m testing...  My best bike is: Genesis Equilibrium with Ultegra 6700

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: time trialling, cyclo cross, commuting, sportives, general fitness riding, fixed/singlespeed, mtb, Mountain Bike Bog Snorkelling, track

Dave is a founding father of, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.

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Martin Thomas | 13 years ago

I feel foolish - I've got a front Boomer (!) but I can't get the cover off. Is there a knack? I'm worried about going down the brute force and ignorance path cos that way usually ends in tears...

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