Gemini Duo 4 Cell bike light review

Tunable, reliable lamp

Our rating 
4.0 out of 5 star rating 4.0
GBP £175.00 RRP | AUD $279.95 | USD $259.95

Our review

Impressively focused power, reliability and extensive tuning in a tiny, well priced package.
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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.

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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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Russell Burton

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

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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.

Product Specifications


Name Name, 0, 10, Name, Duo 4 Cell (14)
Brand Brand, 0, 20, Brand, Gemini

Description Description, 2, 0, Description, Run time 3 hours 15 minutes : LED Two Cree XM-L U2 : Battery Samsung 5200mAh Li-Ion : Mounts - Bar, helmet (tested)
Weight (g) Weight (g), 2, 0, Weight (g), 279