Gemini Xera Flashlight – 2013 Mtbr Lights Shootout

Lights Lights Shootout

The Xera Flashlight comes to us from Gemini and it is exhibits nice design and construction. The light head flares out a bit giving it extra cooling surface area.  The mount is slick and the battery is field replaceable for extended run time with spare batteries.


  • Price: $160
  • Claimed Lumens: 850 Lumens
  • Measured Lumens: 711 Lumens
  • Measured MTBR Lux: 74 Lux
  • Light Head Weight: 167 grams
  • Installed Weight: 180 grams
  • Run Time: 1.5 Hours
  • Category: Flashlight

2013 Gemini Line Up


  • Excellent construction
  • Clean beam pattern
  • Easy to install mount that can be removed for flashlight use
  • Good value light
  • All the utility of flashlight for off the bike use
  • Removable battery for extended run time with spares


  • 734 measured lumens is lower than 850 claimed
  • Light looks too much like the Jet F1 and mount like the Lupine Piko TL
  • Beam pattern is a little narrow


Mounting is done with a rubber loop that is attached to the light with a thumb wheel.  The mount can be adjusted left to right making by loosening and locking the thumb wheel.

MTBR Light Meter Measurements: Compare all lights here.

This light measured 74 Lux on our ambient light measurement facility.

Integrating Sphere Measured Lumens: Compare all lights here.

711 measured Lumens. 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.

Backyard Beam Pattern Photo: Compare all lights here.

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.

Tunnel Beam Pattern Photo: Compare all lights here.

The location is useful since it has walls and a ceiling that can display a bike light beam pattern. The walls have a lot of graffiti on them and actually show detail when they are lit up by a light with a wide angle. Cones and targets are set up with the far target set up at 80 yards.

Photo Thumbnails (click to enlarge)

Related Links
All Mtbr Lights Shootout Articles »
2013 Bike Lights Shootout »
2013 Backyard Beam Pattern Comparisons »
2013 Tunnel Beam Pattern Comparisons »
2013 Mtbr Lux measurements »
2013 Mtbr Lumen Tests »
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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