Dazzling light with a huge flashing mode run-time, but the mounting strap needs to be longer

Infini's Sword Super Bright 30 COB Rear Light certainly lives up to its name – with a light output of 50 lumens it should definitely get you noticed. Add to this the huge run-time – 200 hours on flashing – and I was impressed. However, there is one design feature that lets it down: a short mounting band.

The Sword is a strip light with minimal casing and a simple band mount. This band is integrated and designed to accommodate different tubing widths thanks to three 'openings'. I only ever used the largest one despite attaching the light to several different bikes, and it was a real stretch even on a 27.2mm diameter post, though it does give with use. The shorter strap settings mean you can fix the light to the chainstay.

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The clasp is very awkward initially – the rubber is under a huge amount of tension just to reach round the seatpost and then you have to coax it to sit securely under a small protruding catch. Once attached there is certainly no danger of it slipping off, your efforts are rewarded! After a little use the rubber gave somewhat and mounting became easier, but the rubber has also been excessively stretched now and because of its integrated nature there is no option of resorting to a spare should it break. It seems such a simple oversight, and so easy to amend.

A shaped, detachable rubber pad/shim sits between the light and the seatpost ensuring that the light never slips from its set position. It's moulded to fit into the USB port on one side, protecting it from the elements, and grooved to fit snug against the seatpost on the other side. It's a deep groove, too, which would lend itself well to an aero seatpost, if you can actually make it fit in the first place. I managed it, but it was a real stretch and a fight.

Once you've got the light on, performance is very good. The flashing modes are really striking, giving a good warning to vehicles and pedestrians within a sizeable radius. The 30 COB (chips on board) LEDs sit in a curved transparent casing so the Sword offers side lighting too.

I can also vouch for all of Infini's run-time claims. In high beam you can get just shy of 2 hours, low beam 6 hours, pulsating 4 hours and either of the two flashing modes a huge 200 hours. Changing between modes is a simple click, possible with lightweight gloves, though anything thicker and it becomes very difficult – it's quicker to take your gloves off!

Recharging with the micro USB took 2 hours. The Sword features a low battery warning system: in all five modes a red warning light begins to flash when the battery power is getting low, and in either of the two constant beams the light itself will start flashing as the battery nears flat.

> Check out our guide to the best rear lights

To me, the casing looks a bit cheap, but if you like to leave lights on your bike then this could be a good thing, and when you closely examine the light it looks well put together. It stood up to persistent steady rain, but bear in mind it's described as 'water resistant'. I was careful to give it a quick wipe if it had endured a rainy commute.

All in all, the Sword meets its specification well; its shape results in a substantial strip of bright light that cannot be missed by other road users. It's just a shame the strap isn't a little longer, or replaceable.


Dazzling light with a huge flashing mode run-time, but the mounting strap needs to be longer

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road.cc test report

Make and model: Infini Sword Super Bright 30 COB LED rear light

Size tested: 80x24x31.5mm

Tell us what the light 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?

Infini says: "The Sword is a super bright light for enhanced visibility from the rear and sides."

The USB rechargeable unit offers 50 lumens via 30 Chips Red COB LED. It has five modes and a huge 200 hours of run-time in both flashing modes. The mount is integrated into the unit so no tools or brackets are necessary.

Tell us some more about the technical aspects of the light?

*USB Rechargeable lithium-ion polymer battery.

*Mode memory function (press & hold to turn off).

*Low Battery Indicator.

*Water resistant.

Rate the light for quality of construction:

A tidy unit but a bit cheap in appearance and doesn't really feel very solid. The transparent LED cover is rather exposed, too, but nothing untoward has happened during testing.

Rate the light for design and ease of use. How simple was the light to use?

Easy to switch on and off, possible with lightweight gloves too.

Rate the light for the design and usability of the clamping system/s

A fiddly rubber clasp made even harder to secure by insufficient mounting strap – trying to stretch it round a seatpost and get it round the clasp is not easy. I had it on the largest opening and still had to fight to get the light on the first few times, though it did become easier. The strap is integral to the unit – no risk of losing it but if it breaks, that's it.

Rate the light for waterproofing. How did it stand up to the elements?

No major issues but I was careful to wipe it down after any rides in the rain. Infini only claims water resistance.

Rate the light for battery life. How long did it last? How long did it take to recharge?

Excellent 200 hours in either of two available flashing modes – this makes up for the awkward rubber strap. A recharge time of just over 2 hours was in line with the manufacturer's claim. The rest of the run-times were also in line with Infini's specification.

Rate the light for performance:

The light was indeed super-bright and did exactly what it was supposed to – got me noticed!

Rate the light for durability:

After six weeks of use the strap is still in one piece but it appears to be under excessive strain mounted to my 27.2mm diameter seatpost. The unit itself doesn't seem that solid, but then all it has to do is sit on the bike, and it has survived a couple of accidental drops so can't be that flimsy.

Rate the light for weight:
Rate the light for value:

It's okay but not outstanding given the issue with the strap and the fact that should it break there is no replacement.

Tell us how the light performed overall when used for its designed purpose

Excellent – it's designed to make you seen and it does just that.

Tell us what you particularly liked about the light

The brightness and long run-time.

Tell us what you particularly disliked about the light

The strap needs to be longer to put it under less strain and make it easier to secure round the clasp.

Did you enjoy using the light? Once it was on the bike, yes.

Would you consider buying the light? Unlikely, unless the strap is redesigned.

Would you recommend the light to a friend? If they had a narrow seatpost, yes.

Use this box to explain your score

Performance is good and I'd give it a 7 but for the strap; it just needs to be a little longer.

Overall rating: 6/10

About the tester

Age: 37  Height: 173cm  Weight: 64kg

I usually ride: Road  My best bike is: Carbon road

I've been riding for: Over 20 years  I ride: Most days  I would class myself as: Expert

I regularly do the following types of riding: commuting, touring, club rides, general fitness riding, getting to grips with off roading too!