Bontrager Flare RT & Ion 200 RT Connected Bike Lights In-Depth Review

Bontrager has introduced a new far smaller and much cheaper variant of their popular Flare RT connected bike lights.  These $59 individual front and rear lights connect via ANT+ to supported head units to automatically turn on when you start a ride, and turn off when you end a ride.  You can also control functionality, like light modes, from the head unit itself.

Bontrager is hardly new to the connected lights game; in fact, they were actually the first company to introduce such connected lights using the ANT+ device profile (Garmin then followed a bit later), back in April of 2015.  The initial iteration of the Bontrager Flare RT and Ion RT was actually quite good – and they even had a nifty remote control (still do if you want it) to control the lights.  But these days most riders will likely be using their Garmin bike computers to do so.

The main focus for the new Flare RT and Ion 200 RT lights isn’t so much folks needing massive amounts of light (meaning, it’s not really best for mountain bikers), but rather what the industry roughly terms as ‘safety lights’.  In essence, it’s more about vehicles seeing you than you having the path in front of you lit-up like a stadium.  For those living in cities, it’s perfect – whereas for those living on farm roads…not so much (as I found out).  They’re also perfect as daytime running lights on the bike, since they’re so tiny you’d barely notice them weight-wise or size-wise.

Bontrager sent over a loaner pile of the new lights to try out.  This included both the Flare RT/Ion 200RT lights I’m reviewing here, as well as the Ion Pro Series lights that I’m not focusing on here.  The Pro series lights are also connected, and are quite a bit beefier in terms of size and lumen throw-down (an official term, obviously).  Maybe if there’s interest I’ll also do something on the Pro lights down the (well-lit) road. As usual, once I wrap things up I’ll shoot them all back to Bontrager.

With that – let’s begin!

What’s in the box:

I should probably preface this section with helping you understand the confusing naming scheme that Bontrager has come up with.  That, in turn, might help you try and navigate this review a bit more.

Ion Pro RT: Elongated front light announced this month
Ion 200 RT: Tiny cube front light announced this month (this review)
Ion 350/450 RT: Clunky-looking front lights announced a year or two ago
Ion 700 RT: Cigar-like front light announced a few years ago
Flare RT: Tiny cube rear light announced this month (this review)

Oh, there’s one catch though: Sometimes the Flare RT isn’t this Flare RT. Sometimes it’s an older Flare RT. See, the company actually renamed the product the same thing – an Apple-like ode, without any clear generational or year identifier.

Thus, it’s confusing AF.  You’re welcome.

All you need to know is you want to look for the squarish one, and not the roundish one. Got it? Good, let’s begin unboxing (because the box is actually rather clever).

Here’s the back of the package, which includes a fancy chart to figure out how far away you can see the lights at various brightness levels and flashing modes:

Next, we’ve got the lights inside.  In my case, this is a twofer pack, which saves you a full $5 over the cost of buying them individually. That gets you three $1.50 Costco hotdogs + soda combos…just sayin’.

The packaging is actually fairly clever, since almost everything you need is visible immediately, with only the USB charging cable hanging out on the edges in that little cove.

Here’s all the parts on the table:

A closer look at the two included mounts shows a very slight difference for front and rear.  The rear one is tapered a bit so that it counteracts the slant of your seat post to keep the light level.

As for the lights themselves, they’re tiny – about the size of a strawberry (not the crazy big strawberries, just a normal strawberry):

There’s also a manual in there with all of the various mount options (which I’ll dive into later):

And finally, weight-wise, here ya go.

Interestingly, I think Bontrager might be showing light+mount on their official weight listings. They show 32g/33g, whereas I show 23g, sans-mounts.

How it works:

By and large, the entire point of buying Bontrager’s connected lights is to have them…connected.  But, that doesn’t mean you can only use them in a connected state. You can use them just fine sans-connection (mostly, as I’ll explain).  In short, there are basically three ways you can use these lights:

A) Just as normal lights: Press buttons on lights to turn on/off, and change settings
B) Connected to a head unit: Such as a Garmin device that can control them
C) Connected to Bontrager’s smart remote: Allows you to control them as well, using a tiny remote on your handlebars

I suspect the vast majority of people here are going with ‘Option B’ above, because there’s an overwhelming chance that if you’re reading this you’ve probably got a head unit that can control said lights.  But because you have to eat your vegetables before desert, we’ll start with the boring way, which is just double-pressing the button on the top of the lights (as the manual notes: just like a mouse double-click).

You can then long-hold to turn it off, or, press the button quickly to cycle through all of the different modes the lights have.  It’s really that simple. There’s only a single button, though you can do some ultra-long hold presses to get things reset and such.

There are the following modes for the rear light (Flare RT):

Day Flash  – 90 lumens for 6 hours
All Day Flash – 45 lumens for 12 hours
Night Flash – 5 Lumens for 15 hours
Day Steady – 25 lumens for 4.5 hours
Night Steady – 5 lumens for 13.5 Hours

And these are the modes for the front light (Ion 200 RT):

High – 200 lumens for 1.5 hours
Medium – 100 lumens for 3 hours
Low – 5 lumens for 14.5 hours
Night Flash – 5 lumens for 30 hours
Day Flash – 100 lumens for 12 hours

As an interesting note – when the battery drops below 5%, the unit automatically adjusts the brightness to 50 lumens. This gets you an additional 30 minutes of battery time beyond the stated times above.

Next, pairing to a head unit.  In case of all Bontrager RT lights, they all support ANT+ connectivity using the ANT+ lighting profile. At present, to my knowledge that’s only Garmin that’s implemented it.  Others have talked about it, such as Sigma, but haven’t yet implemented it.  Anybody can implement it, it’s no different than implementing other profiles like power meter or heart rate sensor support.

To pair the Bontrager lights to your Garmin, you’ll head into the sensors menu and add the ‘Lights’ sensor type. Both lights show up as their proper front or rear lights within the menus.

This will create a ‘light network’, which essentially allows all the lights to act cohesively together. You can control them as a formation, or individually if you want.

There are essentially two configuration options for how to control lights.  You can have them automatically turn-on when you power on your Garmin, or you can have them automatically turn-on when you press start:

I’ve set mine for when I press start, so that it’s not burning time while I prep my bike.  Also, one very distinct downside to this setup is that if you’re on the trainer indoors the lights will automatically turn-on. You can disable them entirely via the menus, but that’s not really an ideal solution.  More ideal in my mind would be a tie-in with GPS. If using GPS, then enable them, if not using GPS then disable them.

As I noted earlier, I did find issues with the default Garmin control panel for lights and seemingly overriding the manual button presses when in full formation mode to get in the steady-on mode in some situations.  If you disabled the full formation and went into individual light control mode on the Garmin, the settings seemed to stick.

The other option is to simply grab the Bontrager Connect IQ app (free), which is available for most Garmin Edge devices:

This app gives you a bit more control over the lighting modes, and the settings seem to stick properly. It’s easy to access as well anytime via swiping down from the top – just like you would access the weather.

All of this works just fine and dandy – and makes it easy to use the lights once setup.  Also, when you power off the head unit, it’ll automatically turn off the lights as well.

Finally, let’s talk battery and battery life – starting with charging. To charge the units you’ll grab your favorite micro-USB cable, or use the excessively short micro-USB cables that came with it.

As for battery life, that’ll depend vastly on which specific mode you’re in. If you’ve got the units on full blast (non-blinking), it’ll last far less than differing blinking modes.  That’s no surprise, blinking saves a ton of battery life on most bike lights.  Of course, the challenge to blinking is that many European countries require steady/always-on for usage (which takes more battery life).  But that gets into a bit of lighting religious debate that won’t be solved here.

In my case, I’m using it in a solid-on full-blast configuration.  In one test I did for battery depletion I charged both front and rear lights to 100%, and then got going on my ride. I probably had a few minutes of getting things setup before I started my ride (where the lights were on), but not much more than that.  At the 2 hours 00 minutes 04 seconds marker, the front light powered off, exactly at the specified 2-hour threshold (90 minutes full brightness + 30 minutes battery reserve) for this light in this configuration.  The rear-light meanwhile stayed on and appeared to have more battery – and didn’t reach a low-battery warning state.

I haven’t tested the blinking modes since solid-on lights are required here, though given the unit met specs precisely for the solid-on mode, I don’t doubt the company has the battery specifications correct.  Of course, it’s likely that things like temperature would impact battery life as well.  In my case, I tested on a warm summer night, whereas I’m sure if I tested in the dead of miserable winter, it’d undoubtedly be lower.

Brightness and Visibility:

Probably the most important parts of lights is whether or not you can see things with them, as well as being seen.  In the case of these lights, we’ll start first with what the rider can see.  I rode in a variety of conditions, including city riding, country riding, woods, day-light, dusk, and full-on darkness.  Basically, everything I could think of.

Overall they were good, but given the size things are also a little bit limited as well.  I’d rate them as follows:

Day Riding Anywhere: In this situation, it’s about others seeing you, the lights provide no visible extra light on the ground on a sunny day.

Night City Riding: Perfect, zero issues, and provides just enough light to fill in the cracks in the road and avoid them.  The city provides most of the ambient light for streets.

Dusk: No problems here either – same as night riding, since there’s still a bit of waining light, these lights fill in the gap.

Night Country Road Riding: It’s OK – but ONLY if you’re in the 200 or 100 lumen modes, NOT the 30-minute battery saver mode.

Night Dark Wooded Paths Riding: Same as road riding, but definitely not ideal for mountain biking with any quick trail work. The reach of the light beam just isn’t far enough to get the details you want, so there’s an element of trusting that the road is still actually road (that’s missing in mountain biking). Whereas on bike/running paths surrounded by trees, it’s darker, but you can generally still trust that the pavement is the pavement.

The basic lesson here is that the lights are fine on any pavement surface as long as you’ve got the two full brightness modes on.  The 30-minute (50 lumen) battery saver mode is simply not enough light to do anything except act as a safety light so others see you (which is still incredibly valuable).

So why not show a bunch of photos for the lights?  Because for the most part, photos of bike lights are fake news. It’s all photography tricks.  Every single camera will shoot/show the lights differently.  And most cameras (unless in a full manual mode), will shoot each light differently as they’ll automatically compensate for it.

The only way to do this in any meaningful way is to shoot all the different lights at the exact same time in full manual mode (on camera), and without any other changes in the environment.

For example, here’s a shot I did of the lights against one of the I.Amsterdam signs.  It might look like the light is throwing out a fair bit of light, right?

Kinda, it’s really more the phone is exposing it longer – thus, making it look brighter than it is (as is the waning sky).  Sure, there’s a fair bit of throw there from the lights, but it’s because it’s exposed for 1/4th a second.  If I exposed it for a full second, it’d probably look like day light out.  In the above setting, it’s actually in the 30-minute (50 lumen) saver mode.

Anything and everything you see photographically in any light review is 100% based on the settings the camera person selected.  That person can try and mimic what they see in real-life, but it’ll never match precisely.

Compare that to this GoPro shot taken from a video. It was shot at 30FPS (thus, 1/30th a second), and even though it was shot some 15 minutes earlier, it looks far darker (I’m coming towards the camera, that white dot to the left).  Oh, and the light? At this point it’s in the 200-lumen full brightness mode – far brighter than the above photo/scene.

Not only that, the two lighting conditions were flipped. The first one was taken later at night, and the second earlier with more light (both ambient and the Bontrager unit itself).

Here’s a photo below taken just a moment before the photo above, looking towards the setting sun versus away from it:

Again, a huge difference in what things look like.  You can see the visible light on the ground from the Ion 200 RT though in front of me.

As for others seeing me (or, me seeing my bike), no problems there.  For example, here’s me at dusk riding away from the camera (a GoPro). At this point I’m probably 150-200m away:

And here’s me turning around at roughly that same point and facing the camera:

And then much closer as well:

Again – it all comes down to cameras used.  The below shot was taken perhaps 5 minutes earlier with an iPhone X – and you can see just how much brighter the sky is, and in this specific photo below I’m actually even facing the darker portion of the sky too.

My entire point here is twofold:

A) Visibility of you: No problems here, no matter the conditions.
B) Visibility for you: Good for city riding or places with ambient light, mostly OK for dark riding as long as on highest brightness levels.

Though I suppose my real point is more simplistic: Taking photos of lights doesn’t do much for a review.

All the mounts:

Now I didn’t talk about mounting in the initial section, because I wanted to save it for later. Now is later.

The units come with little bite-sized mounts in the box, which you saw in the unboxing section.  And by and large, these mounts work great. Really, they do. There’s a little bit of extra strap length in some cases on some seat posts, but hardly a big deal, and you could easily trim it if you really wanted to.

Here’s the front mount, mounted:

And here’s the rear mount. You’ll notice in the case of the rear mount that there’s a tiny tilt built into it, to counteract the slanted nature of seat posts.

But this isn’t all the mounts that Bontrager has put together. They’ve got other stem replacement kits that allow you to mix and match Garmin quarter-turn mounts and Bontrager mounts.

You can see below the stem portion, then a middle piece that slides over your bars to allow either a Garmin or GoPro-style mount below it.  Alternatively, if you look above, at right is a snap piece that allows both a GoPro/Bontrager light and Garmin mount concurrently.

I’d love to see one other option here though, in particular perhaps a GoPro to Bontrager mount adapter sold separately, allowing you to easily pop it on existing out-front mounts that have GoPro adapters below them.  The below adapter is part of the stem kit, and is exactly what you need, but only available in the entire stem kit which is much pricier.

GoPro mount adapters have pretty much become the universal standard for mounting stuff on your bike, especially cameras and lights (Cycliq and Garmin both use them), and they’re found on almost all out-front mounts these days.  I’d expect a small piece of plastic adapter wouldn’t cost much, but would make a lot of people happy. [Update: Turns out you can buy it separately…at the mere cost of $25USD].

Feature Comparisons:

(Above left to right: Garmin RTL510, Cycliq Fly6 CE, See.Sense ACE, Bontrager ION 200 RT)

Smart lights are becoming more and more common, with numerous players in the industry making them – and most all of them are using open standards to communicate.  For example: Bontrager, Garmin, See.Sense, and Cycliq all use the ANT+ lighting standard to allow lights to be controlled from any ANT+ capable unit that implements the profile.

But while each company adheres to the specification, each company also has differences in what they have as overall features.  For example, Garmin’s lights tend to fall on the bigger and brighter end of the spectrum (and more costly), whereas the latest Bontrager and See.Sense units are smaller and more affordable.  Of course, Bontrager also makes the bigger lights as part of the Pro series too.  See.Sense has far more connected phone tricks as well, such as theft detection and sending data to urban planners. Then you’ve got Cycliq, which makes the combination bike light and camera units, the Fly6 CE/Fly12 CE series.  And lastly, Garmin also makes a combo – theirs being the combination radar and bike light, the RT510.

Here’s a quick comparison chart I whipped up with the main offerings from each company.  When you get into battery modes things get kinda crazy, so I tried to simplify here into the max battery life for solid and blinking (most companies have numerous modes for each).

Perhaps down the road I’ll create a new product comparison database category…but today is not that day.

Ultimately, like most product categories, it’s really going to come down to what your specific riding conditions are and what you value most.  If you’re riding darker routes, then the Bontrager Ion Pro or Garmin series is probably a better bet.  Whereas if you’re more in city conditions, then the smaller Bontrager or See.Sense units probably make more sense.


The thing about connected bike lights is that they’re easy to make fun of.  People will simply say ‘Just press the button on, stupid’.  And sure, that’s an option.  But if you bike commute every day in the early morning or evening hours, there will undoubtedly be days you simply forget to do that – especially the rear taillight that you wouldn’t likely notice immediately (or days when your brain isn’t fully caffeinated).  These products aim to eliminate that safety risk.

Additionally, as Bontrager points out – they really want folks using these smaller lights as daytime running lights, just like cars do.  In blinking modes, these lights get really solid battery life – far longer than your head unit does.  The idea that you can just start your Garmin and these lights automatically turn on when you press that button (and turn off afterwards), is definitely safety-focused (even if you think it’s silly).

I don’t really have any major complaints here with the new units except the confusing naming scheme – I really like them technically, and I suspect I’ll pick up a set to keep on my bike.  About the only downside that I found is that while the default Garmin app generally works OK with the units, you can’t seemingly set an entire light formation to stay solid-on from the control panel, only individual lights if you separate them out.  The Bontrager Connect IQ app solves this though, so it’s rather minor.

Ultimately – for the $59 each price point, these finally fit the bill from Bontrager. They bring them to a price point slightly cheaper than the existing See.Sense ICON+ lights (albeit with less features), and with a Trek distribution network that hopefully makes them easier for folks to pick up and make themselves more visible.

With that – thanks for reading – and feel free to drop some questions below!

" DC Rainmaker : ."

View Comments (164)

  • Hi.
    This review was very valuable for me as no manual was included with my rear RT Flare light. You explained it very well even though using a Garmin 520 to pair with. All going good thanks to you, and I found the actual online trek manual a little confusing, your good pics of Garmin screens well illustrated each point.
    I think I will purchase the front daytime light as well and have both paired. I also have a Cyclic6 rear light/camera and now realise I can pair it to my Garmin as well. Its when you forget to use the camera is usually the time you actually needed it.

    Greg Finch
    Cambridge, New Zealand

  • JUNK! DON'T BOTHER - Had these lights for five months and they are now DEAD! Have had nothing but problems with them.

    Connected them up with the APP and my Garmin 1000. Lovely while they worked, but all they seemed to do was connect/disconnect/connect and became VERY annoying and had an impact on my batter life on the Garmin.

    I finally gave up on the connection. It was a nice feature but NEVER worked. Then I tried them with just manually starting - really, it's not difficult to push the button. That worked for about a month and then they just stopped working.

    Tried resetting, charging and bleh, nothing. I even checked to make sure my cords were not at fault and nope, they worked fine. I have just now given up, these are going in the trash. What a frustrating experience. Would have been a very GREAT product, if they worked!

    • Thanks Ray for your suggestion, I didn't call support because the website only showed a 30 warranty. However, due to your suggestion I did contact them today online and was happy to find that while the 30 day warranty only applied to returns, not to replacement. I was delighted to find the replacement on these is one year. I am contacting my dealer when they open and arranging an exchange.
      I will let you know what happens.

  • Great review, thanks!
    However, as I sometimes ride all day long I still wonder if the Flare RT and Ion 200 RT can be used while being hooked to a powerbank for charching. This would greatly extend running time of these Bontranger lights on the more powerful modes, which would make it a no-brainer for me to get them.
    I'd greatly appreciate any information regarding this issue.

    • Well, meanwhile I spotted the answer to my question in the german "":
      YES, the Flare RT and Ion 200 RT are fully operable while charging.
      Which is just great!
      So I have placed the order and received them today. And of course I immediately had to verify the good news. Now, nothing stands in the way to bike all day at bright summer sun light and the two RTs on full power steady mode sucking the juice from a powerbank!

  • Great review but need to know if you have figured out if its possible to get the ION 200 RT head light and the Garmin Varia Radar tail light both paired to a Garmin 1030. When I try to set them up the Garmin shows a light network but it seems like one or the other but not both will work. I have the original Varia rectangular radar if that matters. Thanks, Tom

  • can you tell them to get rid off the blue blinky light that is on 24/7 when they are in ant mode because I leave mine in that mode to use the feature obviously and my bike stays in my room so at night I have this blue light going relentlessly , I know its in that mode it does not have to tell me 24/7......arg thank god the blue light stopped working on the front light for whatever reason even though its enabled and in ant mode it would be awesome if the rear did the same thing.....

  • So will the gopro to bontrager adaptor allow me to fit a Flare RT to a gopro saddle rail mount ?


  • Has anyone got the light control CIQ app working with the 830 (or 530)?

    I get this error This app is not compatible with the selected device.

  • Ray -

    Quick question I've been pondering on these two items. From all outward appearances, they are the same size, with the same optics/flash patterns, etc. just two different light colors/brightness levels.

    So my question is as follows: On the same flash pattern (the brightest day flash) how does the Ion 200 at 100 lumens have a battery life of 12 hours, double that of the Flare RT, which claims 6 hours at 90 lumens? 10 lumens less for half the battery life?

    If anything, for longer rides, I'd like my tail lights to have 12 hours of life, and why would bontrager use 2 different batteries for these lights. One would think a hack would exist to swap the batteries/internals (while probably voiding the warranty) to get the extra battery life.

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