The Moon Aerolite COB is a good backup or emergency light, with a long run-time and decent visibility. The mounting options mean it's not really legal on its own but it'll help to get you seen, and the mounting positions make you appear bigger on the road, so that's good too.
In essence, the Aerolite is a barrel with a 60-lumen front light (a single CREE LED), and a 10-lumen 7-chip COB (Chip on Board) rear light. Pressing the single button turns them on or off.
You can have the front light on its own in 60-lumen, 30-lumen or flashing modes, and both together in three further modes: both steady, front steady and rear flashing, and both flashing. It's not hard to get from one to the other, but the light doesn't remember what setting you had it on last, which is a pity.
Run-times are stated from 2hr 40mins from both lights on full to 38 hours for just the front on flashing. I got 2hr 15mins out of mine on full, which, considering its size, isn't at all bad. Charging it up takes a couple of hours from the computer's USB socket.
It's really designed to sit on your helmet, or hang under the end of your drop bars, and there's a bracket included for both use cases. The helmet one has Velcro straps and the bar drop one O-rings, and both have articulated wings to cope with a wider range of helmet or bar shapes. That works pretty well, although it does make the light a bit susceptible to getting knocked off whack. Moon claims you can fit it to flat bars or stays too, but I'm not really sure why you would.
If it's on your head then the light is nice and high and easily visible, and you can point it at signs and potholes. It's not super-bright but the focused beam is still useful.
On the drops it has the benefit of making your bike look wider; the downside is that your hand space on the drops is reduced.
The bracket allows you to angle the light to light your way. Mostly I ran it on my helmet as a supplementary light and it was useful both as an extra light source for reading road signs or fiddling with the bike in the dark, and also as another thing to be seen by – as I said, nice and high and visible. At 60g it's barely noticeable.
The Aerolite is rated IPX4 for waterproofing; that means you can splash water at it but it's not submersible. It's a shame it wasn't sealed (or tested) to a higher level but I didn't have any water get in during testing and it was out in some pretty heavy rain.
Overall, the Aerolite is a good extra bit of visibility and enough of a front light to be useful after dark. Because of the nature of the light and the places that you'd fit it you won't be legal if you run it on its own, although you'll probably be just as visible with this on your head as you would be with a blinky on the bar and the seatpost. It's much easier to recommend as a secondary light.
Good secondary all-in-one front and rear light with a decent beam and long run-times for its size
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road.cc test report
Make and model: Moon Aerolite COB Light
Size tested: n/a
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?
Moon says: "The unique Aerolite provides fantastic visibility making it ideal for the regular rider / commuter. This compact light includes both a front and rear light in one unit"
Tell us some more about the technical aspects of the light?
1 pce Cre XH-G LED (Front) & 7 chip COB LED (Rear)
Rechargeable lithium ion battery 3.7v / 700 mAh
Quick release patented universal bracket
Quick release helmet mount
2 x O rings 20-35mm & 35-52mm
Low battery, charging & fully charged indicator
Automatic fully charged cut off
High precision lens
62 degrees total light angle
11 degrees spot angle
65mm x 23.5mm x 27mm
This light can mount to:
Over drive 60 lumens - 5 hours 50 mins
High 30 lumens - 9 hours 50 mins
Flashing 15 lumens - 38 hours 20 mins
Overdrive / Overdrive 60 lumen front / 10 lumen rear - 2 hours 40 mins
Overdrive flashing 60 lumen front / 5 lumen rear - 4 hours 15 mins
Flashing Flashing 25 lumen front / 5 lumen rear - 13 hours 15 mins
LAA595 - Bracket
LAA596 - Helmet bracket
LAA517 - USB cable
LAA534 - Mains charger
LAA215 - O rings
Only one button, but remembering the last setting would be a bonus.
Versatile and easy to use.
IPX4 isn't exactly submersible but no issues in testing.
Very good for such a small light.
Tell us how the light performed overall when used for its designed purpose
Tell us what you particularly liked about the light
Simple, light, good run-time.
Tell us what you particularly disliked about the light
Waterproofing could be a higher rating, mounts can be a touch fiddly.
Did you enjoy using the light? Yes
Would you consider buying the light? Yes
Would you recommend the light to a friend? Yes
Use this box to explain your score
Very useful extra light.
About the tester
I usually ride: whatever I'm testing... My best bike is: Kinesis Tripster ATR, Kinesis Aithein
I've been riding for: Over 20 years I ride: Every day I would class myself as: Experienced
I regularly do the following types of riding: road racing, time trialling, cyclo-cross, commuting, club rides, sportives, general fitness riding, fixed/singlespeed, mountain biking, Mountain Bike Bog Snorkelling, track
Dave is a founding father of road.cc, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.