Gemini Duo 4 Cell bike light review£175.00

Tunable, reliable lamp

BikeRadar score4/5

This review is a small part of our Best Mountain Bike Lights feature, where we tell you the three best lights - plus eight others to consider - after testing 24 different sets of lights.

The Gemini’s tiny twin LED headunit delivers 1,500 lumens of punchy long-distance light and enough peripheral to work adequately when it's mounted on your bars.

As well as the O-ring bar mount it comes with a helmet mount and headstrap harness.

The three power levels are at 20 / 60 / 100 percent output as default with a clear click from the rubber button making it fine to use even with cold, gloved fingers. You can program the different light levels – even the flashing mode – in 10 percent increments if the preset menu doesn’t suit you though.

There’s no battery run-time indicator aside from a low power warning, but run time is long enough for that to rarely be a problem.

The four-cell battery bag is compact enough to fit easily and securely on the frame or longer stems, and if you want even smaller bulk and are happy cruising on a lower light setting there’s also a (slightly cheaper) two-cell battery version.

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The light output gives great long-distance vision, and decent peripheral too

While you can get more power for less from direct-buy ‘Chinese lanterns’, reliability on every Gemini light we’ve ever used has been excellent and they’re better priced than similarly versatile and tunable units.

This article was originally published in What Mountain Bike magazine.

Guy Kesteven

Freelance Writer, UK
Guy started filling his brain with cycle stats and steaming up bike shop windows back in 1980. He worked the other side of those windows from '89 while getting a degree in “describing broken things covered in mud" (archaeology). Dug historical holes in the ground through the early '90s, then became a pro bike tester in '97. Guy has ridden thousands of bikes and even more components the world over since then and can remember them all in vivid, haunting detail. Can't remember where the car keys are, though.
  • Age: 45
  • Height: 180cm / 5' 11"
  • Weight: 68kg / 150lb
  • Waist: 76cm / 30in
  • Chest: 91cm / 36in
  • Discipline: Strict sadomasochist
  • Preferred Terrain: Technical off-piste singletrack and twisted back roads. Up, down, along — so long as it's faster than the last time he did it he's happy.
  • Current Bikes: An ever changing herd of test machines from Tri bikes to fat bikes and everything in between.
  • Dream Bike: His Nicolai Helius AM custom tandem
  • Beer of Choice: Theakston's Old Peculier (not Peculiar)
  • Location: Yorkshire, UK

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