2015 Lights Shootout

The Gloworm is a little monster of a light. Putting out more output than Niterider Pro 2200 or the Light and Motion Seca 2000, the XS accomplishes the feat in a lighthead that is half the size of the others. Yet it is still able to cool itself off when allowed airflow. Such size makes it flexible for handlebar or even helmet use. The beam pattern is pretty wide and it makes good use of the available light to give good peripheral vision.

This year, the XS sports a quick release system that is GoPro compatible. This opens up the unit to GoPro and other third party mounts.

The head unit weighs 110 grams but it delivers an incredibly bright and consistent light that measured in at 2350 Lumens. The light has a wired remote switch that will keep your hands away from the head unit that can get hot. And it will bring the switch by your fingertips when the light is bar mounted. The light also includes a bar mount in addition to the helmet mount.

And finally, battery pack looks good with Panasonic cells and a fuel gauge on the pack. Run time is an excellent 2 hours at max output. Two packs are available, a 4-cell and a 2-cell one and we used the 4-cell on this test which takes 5 hours to charge. Programability is one of the high points of the Gloworm design, as there is almost a limitless amount of light levels and options available. It is well-designed but any UI that doesn't have displays or monitors requires a bit of practice to get used to.

Test loop with the Gloworm XS. Camera is on a locked ISO setting and is set to Wide Angle mode

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 »

Gloworm XS Backyard Beam Pattern

Integrating Sphere Measured Lumens

This light measured 2359 Lumens in an integrating sphere. Claimed Lumens by the manufacturer is 2200 Lumens. The Lumen-hour graph below shows how the light performs over the first three minutes of its battery cycle. Compare all Lumen Tests here »

Gloworm XS Lumen Chart


  • Great, very wide beam pattern
  • Both mounts included and remote switch as well
  • 2350 lumen output is excellent
  • Good run time and available battery option to optimize for weight
  • Extremely compact packaging means it's very portable
  • Better than the claimed 2200 Lumens


  • Programming requires practice (like the GoPro user interface)
  • Remote switch may not be preferred by all since it occupies more space


  • Price: $350
  • Claimed Lumens: 2200 Lumens
  • Measured Lumens: 2359 Lumens
  • Lumens per $: 6.74 Lumens
  • Lumens per gram: 6.86 Lumens
  • Time on High: 2:00 Hours
  • Charge Time: 6:00 Hours
  • Mounted Weight: 344 grams
  • Category: High End

Overall Rating

0 Flamin' Chili Peppers
4.5 out of 5 Flamin' Chili Peppers

For more information visit www.glowormlites.co.nz.

This article is part of Mtbr and RoadBikeReview's 2015 Lights Shootout. To see all the bike lights tested CLICK HERE.