Gemini Duo LED 1400 4-cell

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Ignore the Wall-E looks of the headlamp and look deeper and you’ll see that the Gemini has a lot more going for it than it appears. The system features a twin LED headlight with a soft rubber button on the back side, connected to a four-cell oblong battery. There are a couple of extras in the box, like an extension cable for mounting the battery on the seatpost, and there’s a helmet mount too.

Plugging in, you’re greeted with a soft green glow from the power button. This can be a little off-putting if you’re following a bike on a car roof rack with the lights connected, but it takes a negligible amount of battery power and when in use, it reassures you that you still have plenty of juice. The light attaches with a strong, simple O-ring and can pivot side to side.

That single button is the key to the system. Pressing it will get you into the low/medium/high cycle, but holding it in will put you into program mode, where you can customise the power of each mode. Want a 100% high beam (1400 lumens, three hours) and then 20% (280 lumens, 18 hours) and then 10% (140 lumens, 38 hours)? It’s yours.

The beam pattern is a large smooth spot, with a steady fall off to the sides, great for most trail uses, whether on the bars or a helmet (though there’s a cheaper two-cell version for that, or for ‘hard, fast and short-lived’ riders).

Overall: Simple to use, bombproof and yet easy to program to be as complicated as you’ll need.

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Mr. Chipps Chippendale

Singletrackworld's ex-Editor At Large

With 25 years as Editor of Singletrack World Magazine, Chipps holds the record for the longest-running mountain bike magazine editor in the world. He started in the bike trade in 1990 and became a full time mountain bike journalist at the start of 1994. Chipps stepped down as Editor in April 2026 after 25 years at the helm. He's now wondering what to do next, while riding his bike in the French Pyrenees, where he also runs some gites.

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