Compare the latest tech products

Review: Defender Bike Light


September 30, 2013

The Defender, in place on the handlebars and ready to go

The Defender, in place on the handlebars and ready to go

Image Gallery (8 images)

Last year, a couple of MIT grads took to Kickstarter to raise production funds for their just-about-everything-proof bicycle light, the Defender. Made mainly from a solid block of aluminum, the light was reportedly tough as nails, waterproof, and very theft-resistant. It was also designed to look like the cylinder of a revolver. Well, the Kickstarter project was a success, and the light is now available for purchase. I got my hands on one, to see if it actually lives up to its makers' claims.

First of all, the 232-gram (8-oz) Defender does indeed look cool. This is particularly true if you get the black model, as opposed to the chrome version. It's made by Massachusetts-based Fortified Bicycle Alliance, which was formerly known as Gotham Bicycle Defense Industries – as a result it still has the word "GOTHAM" emblazoned on its side (or at least, mine does), which makes it look just that much more like Batman's bike light.

As far as its toughness and waterproofing go, I can attest to the facts that it survived being repeatedly hurled point-blank into the dirt and getting placed under a running kitchen faucet. I could have tried smashing it against the sidewalk or leaving it in an aquarium overnight, although I thought that doing so might be a tad excessive.

Its mounting clamp is tightened onto the handlebars using an included security screwdriver, which looks a bit like a hex wrench, but with weird non-hex bits on either end. This is what makes the light theft-resistant, as the average opportunistic parts thief isn't likely to be carrying such a specialized tool when they happen upon your bike. They could always go out and buy one if they decided to make a point of stealing someone's Defender, although such a scenario seems pretty unlikely.

When mounting my light, I found that the screwdriver didn't engage the corresponding clamp bolt nearly as satisfyingly as would be the case with a hex wrench. There was less of a feeling of the bit "popping" into place within the bolt head, and the wrench still wiggled from side to side even when completely engaged. Fortunately, though, the idea with the Defender is that you install it once and then leave it on your bars forever, rain or shine – it was certainly possible to tighten it down the one time using the security screwdriver, and the benefits definitely outweigh the slight hassle.

On both my mountain and road bikes, the handlebars are skinnier at the ends, and fatter in the middle. Given that the ends are already home to the brake levers and shifters, this meant that the Defender had to be mounted close to the middle. Even when using the thinner of the two included clamp grip pads, however, I found that the longer of the two included bolts still couldn't bridge the gap between the top and bottom of the clamp. Fortunately, replacing the pad with a strip of an old inner tube served as a very simple and effective solution. It's something that would be easy for anyone to do, although Fortified Bicycle Alliance might want to start including an even thinner pad in the package.

Once the light was mounted, it was time to do some riding in the dark.

Despite its six LED bulbs, the Defender has an output of just 50 lumens. If you're someone who ultimately goes only with numbers, then you likely already know that commuting lights with an output of up to 150 lumens are no longer that uncommon. Fortified is even developing one of its own, known as the Aviator.

The fact is, however, that you shouldn't just go with numbers. The arrangement of the Defender's bulbs give its main spotlight a 30-degree spread, but also add an 80-degree peripheral "ring" of bright light to its conical beam. That ring produces a bar of light on the road, perpendicular to the bike's front wheel, making it highly visible to motorists. The light itself is also pretty hard to miss when seen from the front, particularly when set to flashing mode.

That said, when riding in an unlit back alley, I found that the Defender's spotlight just wasn't bright enough to illuminate the road as much as I'd like. If you're sticking to the streetlights and don't need a light in order to see the road, though, it makes an excellent "be-seen" headlight.

The Defender runs on three included AA batteries, that provide a run time of 50 hours on steady or 100 hours in flashing mode. It's priced at US$65 for the black model, or $59 for the chrome.

Product page: Defender Bike Light

About the Author
Ben Coxworth An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away. All articles by Ben Coxworth

How does it keep jackwads from turning on the light when you are not there?


someone could Just steal the whole handle bar, 50 lumens is piss poor for that price.

Denis Klanac

Sure my TK45 is heavier, but there is absolutely no way an oncoming motorist will drive toward me unless they are a human-moth hybrid. When I first saw a picture of this , I was thinking it would come in at 400+ lumens. It looks to me like the innovation here is a fiddley wrench-thingy. Bravo.


50 lumens is way too little. Who cares if it's indestructible if it does not illuminate the path properly?


Only 50 lumens ?

I recently upgraded from a barely adequate 300 lumen single LED to an 1800 lumen single LED light for about $30.

I like the security aspect but why only 50 lumens ? I like the looks but nearly useless at only 50 lumens.

Hi-power LCDs are not that expensive so why go to the effort to make a nice light but only have 50 lumens?

You need to do some real world city riding where you go from well lighted streets to streets with no lights; with cars coming up from behind and from the front and then try to see where you are going with only 50 lumens.

With 6 LEDs some could be steady and some flashing at the same time. All 6 could be at least 300 lumens each. Battery life should not be a problem. Not many people ride more than a couple of hours at night. Midnight century rides ? I ride 15 miles home across town. It takes about an hour. I don't have to recharge every night, more like once a week but I expect battery life to go down eventually and need to recharge every night, Then new batteries.

50 lumens? Why bother?

Post a Comment

Login with your Gizmag account:

Related Articles
Looking for something? Search our articles