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Moon X-Power 780 front light



Well-made and bright with attractive replaceable battery option, but let down by a poor helmet mount, barmy flashing options and sub-optimal beam pattern

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The X-Power 780 is the most powerful option in Hong Kong-based Moon's 'all-in-one' range, where the battery is integral to the light. A claimed output of 780 Lumens should put this light at the high end of the self-contained market, and be taking the convenience-lead fight to other systems using external batteries that might offer the same or only slightly more light. With an RRP of £99.99 it's certainly a premium outlay, however the X-Power 780 can be had easily from reputable dealers for as low as £64 at time of writing.

The packaging and User Guideline are a sublime journey into Chinese-English translation done cheap. You can't help but feel Moon would have done well to find an ex-pat propping up a bar somewhere in Kowloon and had the grammar checked for the cost of a few IPAs. Inside the box is a handlebar mount that might have been made by Isambard Brunel, it's that solid. It's good for 22-31.8mm bars - however fitting to 31.8mm required winding the adjuster all the way out then squeezing to get the knurled knob into the locking indentation. The clamping/hinge areas are away from the front where the clamp might interfere with brake/shifter cables emerging from under the bartape. It can also easily be mounted upside-down, and while this isn't in the user guide there's no reason to suspect this is any less secure an orientation. The light locks onto the mount with a reassuringly solid click, and is held very securely. Release is via a push-button on the left side that is doable single-handed with thinnish gloves on. The mount clicks a maximum of 45° to the left or right in 4 solid steps.

Also included is a helmet mount, USB 700mA-output wall charger brick and short micro USB cable. The Velcro-strap helmet mount has the unisex Velcro side towards your head when fitted to a helmet, so unless you have a moptop or wear a cap/beanie you're possibly going to get scratched up. The mount has an adjustable angle knob to get the beam just where you want it, but this means the mount is also quite tall, lifting the light a good inch above the helmet itself. The 207g weight of light and helmet mount coupled with the height of the mount means there is noticeable mass atop your noggin. A tight chinstrap and headband are required to stop the whole lot flopping about. This mount would have been much better securing the light flush with the helmet, but maybe there was a good reason for not going that route. More on that later.

The XP-780 has a removable 3300mAh battery, and you can get spares for £20 via the Moon store on Amazon. There's a coin slot in the rear of the battery to aid battery locking/unlocking - but a good press with the palm of your hand is enough to grip the slots and turn the battery. It's keyed, so incorrect insertion is impossible.

The XP-780 has a silver metal chassis, with black plastic at the front and rear. It charges via a micro-USB port underneath the lens at the front, covered by a rubber grommet. When charging the on-off button shows a slow blue heartbeat which turns solid once charged after about four hours using the supplied charger. The literature claims a one percent loss of charge per day and points out that run time decreases by fifty percent at zero degrees, an important consideration if using for winter rides. The run times are also listed as 'up to' - somewhat concerning, I'd have preferred an 'at least'.

Operation is via a single rubberised button flush on the top centre that doubles as a charge indicator, showing blue, then green, red and flashing red as the charge level drops in 25% steps. It's a single quick press to turn on and goes to the last-used mode, either solid or flashing, and always turns on at the brightest 'Overdrive' 780-Lumen level. A double press from off or while in use changes modes between solid and flashing, and it's a 1-second long press to turn off. The fact it's a single fast press of a flush button to turn on does raise the concern of accidentally switching on in a bag or pocket, which the removable battery goes some way to address. The area of the button is large enough that use through thick-ish gloves is possible.

In use the flashing mode is really a one-trick pony, with the only usable option being the 2.4Hz flash which appears to operate at the brightest power level. This falls into the category of 'stoopidbright' in my book, throwing back strong reflections from roadsigns at several hundred yards distance, even in daylight. In close proximity to vehicles in an urban setting it's overkill and simply wastes battery and is likely to annoy other road users. The other two options are an epilepsy-inducing superfast strobe and a rather daft SOS mode, only really of use to Enid Blyton re-enactors on Dartmoor after Timmy's scarpered.

There are dedicated side-light ports off the main LED to aid peripheral visibility, the main lens not being visible itself from the side. It has a 100° flood and 19° spot pattern, which means the spot beam brightness makes you tilt it to almost horizontal to get the optimal balance between distant and near-field illumination. As well as being not as recommended in the manual at all, that's wasteful of 50% of the output and highly likely to annoy oncoming traffic.

It's perceivably brighter than the Lezyne Power Drive XL, but does have nearly twice the Lumens in Overdrive mode. The XP-780 has a protection mode which will dim the light if it overheats - and run hot it does. Leaving it on full for a few minutes during discharge testing on an office desk where the tip of the light was accidentally touching a neoprene case resulted in a melted ring on said case, only noticed when it started to smell. You definitely don't want to leave this light in a bag with the battery fitted, the combination of an easily-pressed On button plus powering on at the brightest setting making for a potentially expensive discovery if it was piled in next to your new Gabba. Possibly this heat issue is why the helmet mount is so tall, to remove the chance of the lens area melting thin helmet shells.

On the bike over rough roads the bar mount performed admirably, with no movement or rattle. In full darkness the light emitted by the button is not intrusive as some can be, and was bright enough to inform without dazzling when looked at. Operating the button on the bike while wearing gloves did result in one panicky moment trying to find the button again after holding it down accidentally for too long and turning it off, but this was possibly an end-user issue. Once turned on in the highest power setting three other levels can be selected by pressing through the steps. This will get annoying after a few commutes, remembering to click through from Overdrive (1:30 run time) to High (2:50) to Standard (3:20) and Low (7:30).

For quick night riding on unlit roads the headline 780-Lumen Overdrive mode is the only real option. I found it possible to do 15MPH over potholed leaf-strewn damp lanes, but no quicker. In Overdrive mode there was approximately 15 minutes between each charge level - so after just 45 minutes you are into 25% remaining red+flashing button territory. Once into the bottom 25% there is no further warning of decreasing brightness / looming shutdown, the brightness slowly ebbing away until at the proclaimed 90 minutes it's only good for a very leisurely pace. The brightness continues to dim until dying completely at a total runtime of 3 hours. One notably smart feature is that should you get caught out by an unexpectedly longer ride, if you are in green, red or red+flashing then choosing a lower power level will change the button colour as it re-assesses capacity based on your new power level and remaining charge.

Using the XP-780 as a 'be seen by' daytime flasher means using the aforementioned 2.4Hz flash mode, with an advertised run time of 5:20. I managed to get 3:30 out of it before hitting 25% charge, meaning 5:20 is likely as a daytime flash outcome. For the brightness level this isn't bad - best for fast, open roads though.

So where does this leave the XP-780? Somewhere between a constant-output commuter be-seen-by for the three lowest light outputs, a club run front flasher for open/overshadowed roads, and a sub-90-minute slowish dark lanes option using the Overdrive setting - or longer with an extra battery or two. If you are flicking between highest and lowest modes to optimise run time between descents and climbs, be prepared for a *lot* of pressing to cycle through the four options and genuine excitement when you hold for a fraction too long. Lezyne's 'Overdrive Race Mode' which removes four options leaving you with Overdrive and Economy selected by a single quick press (think High/Low beam) is a damn good idea, and Moon would be well advised to do something similar to ease the pain of managing scarce power.

Based on the Light Comparator Engine the beam shape is almost identical to the Lezyne Power Drive 800 - but the Lezyne is much more user-friendly in terms of on-the-bike operation for a fiver less RRP. Having a maximum brightness that beats the competition is no use if power is so difficult to manage on the bars that the battery runs out prematurely.


Well-made and bright with attractive replaceable battery option, but let down by a poor helmet mount, barmy flashing options and sub-optimal beam pattern

The light comparator

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Make and model: Moon X-Power 780 front light

Size tested: n/a

Tell us some more about the technical aspects of the light?

The LED is a CREE XM-L U2, claimed life of 50,000 hours. Battery is a Lithium Ion 3300mAh removable unit, charged in the light using a supplied micro-USB lead. Maximum light output is 780 Lumens

The light is surprisingly 'hefty' in the hand - there is obviously a lot of metal involved. The fit and finish are very good, with close tolerances.

Rate the light for design and ease of use. How simple was the light to use?

The major let-down for this light is the need to cycle through the solid-beam power settings every time the light is turned on. This will rapidly become an annoyance.

Rate the light for the design and usability of the clamping system/s

Very, very well-designed and absolutely solid handlebar mount. Helmet mount is too tall with poorly-thought-out velcro placement.

Rate the light for waterproofing. How did it stand up to the elements?

The unit is described by the manufacturer as 'for rain water only - do not submerge'.

Rate the light for battery life. How long did it last? How long did it take to recharge?

The light is a victim of its own potential brightness, with users logically expecting to be able to use the brightest mode for a substantial time. Expectations need to be set that whilst you can ride at a brisk pace in the dark using this light, it won't be for a long period. Charge time is around 4 hours.

Rate the light for performance:

The circular beam and focus of the spot portion means the light needs to be positioned almost horizontal for optimal light spread. This is wasteful of power and annoying for other road users. In an off-road context, however, this would facilitate better depth perception and spotting of overhead hazards such as branches.

Rate the light for durability:

Whilst only on test briefly, the unit does feel solid and no durability issues are foreseen.

Rate the light for weight, if applicable:

'Reassuringly solid' at 177g in the hand, but too heavy for helmet mounting with the provided stalk mount.

Rate the light for comfort, if applicable:

If worn on the helmet, it's too heavy using the provided mount.

Rate the light for value:

If the flashing modes were better though-out this would be cracking value at around £67 average retail price, or even close to the £99 RRP. As it is I'd be 'happy' putting up with the various issues for maybe £30-40, not more.

Tell us how the light performed overall when used for its designed purpose

Overall, it was good, but with annoying let-downs.

Tell us what you particularly liked about the light

Build quality and handlebar mount, plus the removable battery.

Tell us what you particularly disliked about the light

The button operation and the beam shape.

Did you enjoy using the light? Yes. Sort of.

Would you consider buying the light? At the right price, yes. But not at anywhere near RRP.

Would you recommend the light to a friend? Yes, but again only at well below RRP, and making sure they understood the drawbacks.

Anything further to say about the light in conclusion?

With a software update to change the button operation, and maybe a tweak of the lens/beam pattern, this could be a cracking light. Until then, it's an overall 'average', no more.

Tell us what the light is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

This light is for someone wanting an all-in-one light bright enough for unlit roads at night, that can double for daylight rides on fast roads.

Rate the light for quality of construction:

Overall rating: 5/10

About the tester

Age: 41  Height: 183cm  Weight: 73KG

I usually ride: Charge Juicer  My best bike is:

I've been riding for: Over 20 years  I ride: A few times a week  I would class myself as: Expert

I regularly do the following types of riding: club rides, general fitness riding, fixed/singlespeed, mtb, MTB, singlespeed and Dutch bike pootling


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