Review: Fenix BTR20

Lights Lights Shootout

The Fenix BTR20 is a good light with a dual beam pattern coming out of one head. Using special lens optics, they are able to project a wide beam and a focused spot beam at the same time. This is great for cyclists as this is what’s really needed to see peripheral objects at low speed and the far away trail features at high speed.

Does it work? We think so. There is indeed a spot that throws far ahead on the trail as you can see in the beam pattern shot. But you will also notice that the grass is lit up for good peripheral vision. Light color is good too with a slightly yellow tint that’s easy on they eyes that reveals contrast and trail contours.

There is a remote light switch that can turn the light on and off and change levels mounted right beside the handlebar grips. And there is a battery indicator with four LEDs that show the user the battery charge percentage.

Battery, charger and other accessories have good build quality and performed well during our test.

  • Price: $150 approximately
  • Claimed Lumens: 850 Lumens
  • Measured Lumens: 875 Lumens
  • Measured MTBR Lux: 88 Lux
  • Lumens per $: 6.25 Lumens
  • Lumens per gram: 44 Lumens
  • Time on High: 1:50 Hours
  • Charge Time: 2:00 Hours
  • Mounted Weight: 358 grams
  • Category: High End, Commuter
  • Good innovation with lens optics
  • Good beam quality
  • Remote switch
  • Battery case and charge indicator
  • Should be 1200 Lumens to make a good dent in this competitive field

An excellent bar mount is included and an independent helmet mount is available as well. The light can be aimed left to right.

Mtbr Light Meter Measurements

This light measured 88 Lux on our ambient light measurement facility. The light output measurement is performed by placing a Lux light meter beside the light. Both are pointed at the ceiling (five feet above) of a dark room. This measurement uses the ambient light produced by the bike light.

Integrating Sphere Measured Lumens

This light measured 875 Lumens in an integrating sphere. Claimed Lumens by the manufacturer is 850 Lumens. The Lumen-hour graph below shows how the light performs over the first three minutes of its battery cycle.

Beam Pattern Photo

We photographed the lights in the same location setting with the same camera settings. The photos were taken in the back yard that is approximately 25 yards long. These photos feature many objects and a distinct background to analyze detail and beam pattern.

Compare all Beam Patterns here »

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Related Links
2014 Tunnel Beam Pattern Comparisons »
2014 Mtbr Lumen Tests »
2013 Bike Lights Shootout »
2012 Bike Lights Shootout »
Mtbr Lights Reviews »
Mtbr Lights Forum »

About the author: Francis Cebedo

The founder of mtbr and roadbikereview, Francis Cebedo believes that every cyclist has a lot to teach and a lot to learn. "Our websites are communal hubs for sharing cycling experiences, trading adventure stories, and passing along product information and opinions." Francis' favorite bike is the last bike he rode, whether it's a dirt jumper, singlespeed, trail bike, lugged commuter or ultralight carbon road steed. Indeed, Francis loves cycling in all its forms and is happiest when infecting others with that same passion. Francis also believes that IPA will save America.

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  • Catmando says:

    Battery type, capacity…??????

  • superfly says:

    You need 700+lumens? You don’t ride enough! My 50 lumens works at Demo!

  • ViennaCLS says:

    I cannot read 875lumen from your graph.
    And Fenix says that maxiumu output is 800lumen not 850lumen
    and runtime is 2hr, not 1h50min.

  • Alan Doak says:

    I appreciate many aspects of your reviews, but they focus too much on the max output. For 24hr+ enduro and multi-day events (ktr, ctr, AZT300, etc.) the light is usually in low to mid mode, and high mode is only used for short sections of fast downhill.

    Please include the brightness and runtime of other brightness settings in your review. Efficiency is super important, knowing if the light has linear regulation or buck/boost regulation and will give a bit of insight into this.


  • Charles says:

    I’ve been using Fenix tactical lights for 5 plus years with no issues and yes I daily carry one, flawless!
    I picked up this BTR20 because of how well my other Fenix lights worked. Fenix has to be one of the most underrated light companys out there. Bang for the buck and durability is outstanding. I use mine alot on my XC29er and it lights up about a city block in front of me. I’ve never felt like I’ve needed more light when I’m using this in the city orthe trail. I find in some cases I have to turn this light down because on high power it’s too bright in some situations.
    I find Fenixs specs and run times are pretty bang on.

  • Mark Andrews says:

    I would like to know if it is possible to have the batteries mounted on the helmet as it is always a pain to have the battery in the backpack. Makes it kinda difficult to take the pack/helmet on and off easily.

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