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Gemini Xera LED 850 Lumen 4 Cell Light System


The Gemini Lights Xera LED 850 Lumen 4 Cell Light System is powerful, lightweight, versatile and affordable. With an output of 850 lumens, you can be sure the Xera LED Light System will shine your pants off. The top-of-the-line…

Gemini Xera LED 850 Lumen 4 Cell Light System


The Gemini Lights Xera LED 850 Lumen 4 Cell Light System is powerful, lightweight, versatile and affordable. With an output of 850 lumens, you can be sure the Xera LED Light System will shine your pants off. The top-of-the-line CREE XM-L emitter is currently the top contender for maximum efficiency and brightness delivered in a small package. The Xera weighs just 52g. It’s tiny and extremely powerful. Fit for races and fit for you. Our lumens are measured in an integrating sphere (very expensive piece of equipment) in CREE’s labs. It’s fairly common for manufacturer’s to state claimed lumens over their actual output. We believe in honest out-the-front lumens. In light reviews, we’re consistently praised for this. No longer do you have to settle for decisions made for you. Set your mode sequence and brightness settings on-the-fly at the touch of a button. Whichever mode, whatever brightness level, it’s entirely up to you and we leave it in your hands. And for those wishing not to twiddle with settings, don’t worry. Out-of-the-box your light comes with default High, Medium and Low settings for you. The Xera LED light also includes a factory reset function. With the Xera LED Light System, we’ve left nothing out. Experience night skiing, running and mountain biking all in the dark. Xera is helmet mountable, bar mountable and even includes a comfortable head belt mount. The complete system can be carried on the head leaving no dangling wires to your camelbak. The same essential features from the Gemini ethos exist on the Xera such as battery indication, overheat and overcharge protection. We took care of the complexities so you can have the best, worry-free experience.


Product Specifications: 850 Lumens; 52g (Light head); 16 degree beam angle; High, Med, Low, Flash (User Intuitive Programming) modes; CREE XM-L LED; constructed from hard Anodized T6 Aluminium; battery overcharge and overheat protection; LED overheat protection; IP65 weatherproof.



Front Light

Light Source:



850 Lumens

Power Source:

Lithium ion battery

Run Time:

4 hours on maximum, 8 hours on medium, 12 hours on low, 16 hours on flash


Helmet and bar mount

Light Modes:

High/Medium/Low/Flash (User Intuitive Programming)

In the Box:

Gemini Xera LED Light; high-capacity 4-cell battery pack (hard case); lithium ion smart charger; helmet mount and bar mount; Pro Head Belt; silicone o-rings; extension cable

Buying Guides



A buying guide that offers general advice on lighting

Customer Reviews

Product no longer available for purchase



We offer a range of delivery services for our UK and International customers. UK Customers can select our FREE standard delivery option on most non bike orders over £20. Or if you’re in a hurry you can upgrade to our Next Day, Saturday or Sunday delivery services. You can also use our free Click & Collect service, where you can collect your purchases from a choice of over 50 Evans Cycles stores. International customers can benefit from FREE delivery on most orders and save UK VAT if we are shipping outside of the EU.

Bike build & delivery

UK bike delivery charge includes assembly by our fully trained mechanics, pre-delivery inspection and safety check, packing in our custom bike box, multi-tool and delivery from only £9.99 per bike.Click here to see how we deliver your bike

Standard, Next Day, Saturday & Sunday UK delivery

We offer a FREE standard delivery service on orders over £20, as well as Next Day, Saturday & Sunday delivery options to UK addresses. Click here for more details

Click & Collect

Using our Click & Collect service your order will be delivered to a choice of over 50 Evans Cycles stores nationwide for collection. This service is FREE of charge for all orders. To check store stock and collection times, use the "Check store stock" button above. Click here for more details

International delivery (Incl BFPO, ROI, Channel Island & Isle of Man)

We offer a FREE delivery service on most International orders. Orders delivered outside the EU are exempt from VAT. To calculate the charges for your order simply add products to your basket and proceed through the checkout process, where you will need to enter your delivery details. Our website will present you with the relevant delivery options and the charges for your basket of goods. Click here for more details.

Easy Returns

Our priority is to ensure that you are highly satisfied with your purchase. In the unlikely event that you are not, please feel free to return your goods within 90 days of the purchase date for a full exchange or refund. Returns can be made in your local store or sent back to our distribution centre.

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