Moon Crescent rear light



Good light but you'll need a disciplined charging regime to get the best from it

A stylish wee light from Moon, the Crescent packs a decent punch but the modest runtime limits its appeal.

Remember the huge D cell monstrosities that weighed down our bikes when we were kids? Be grateful if you're young enough not to, for they were dark times, often literally; the wretched things were about as reliable as a marzipan pickaxe. If you want proof of how far we've come since the LED revolution started, just check out the Moon Crescent.

The Crescent is a tiny package wrapping a strip of 15 LEDs in a translucent red casing. It's so small you'd be forgiven for wondering where the battery is and a quick glance at the run times confirms that the battery is indeed, very small. Of course being small, light and powerful (25 lumens) puts it in prime MAMIL-bait territory. That isn't to say that it's a case of style over substance, but with a maximum run time of six hours (and a mere 1:30 if you want all 25 lumens on steady) it's not a light that lends itself to regular commutes or long night rides.

The six modes are accessed by either a single press or a double click on the button. The button sits flush with the face, so leaving the light bouncing round in a bag pretty much guarantees it will switch itself on at some point, which is an annoying habit if you tend to remove your lights when parked.

There are three steady modes and three flashing, including a disco-twitch strobe that we're not entirely convinced about. The lowest flash setting gives you more than enough visibility (and the longest run time) and that was the one I used pretty much all the time. Yes, the light does boast 25 lumens but using them all gives such a short runtime that it's just not practical.

The robust rubber strap works well although it's rather over-engineered given the tiny size of the light. You can adjust the angle of the bracket through a number of preset clicks although it's stiff enough that you might be forgiven for thinking that it was fixed.

Charging is via the USB port, concealed under a hefty and well fitted rubber plug. Like it's big sister, the Moon Shield, the Crescent has a low battery indicator. I've been using that light for a year now and I've never actually seen it, which suggests that it's not particularly effective.

The ultra convenient rubber bracket means that this will probably find itself being pressed into regular service across my fleet, I just need to make sure I keep it properly charged.


A good light but you'll need a disciplined charging regime to get the best from it.

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Make and model: Moon Crescent rear light

Size tested: n/a

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

15 chips high brightness red Led

- Rechargeable lithium polymer battery( 3.7V 300mAh)

- 6 modes : Standard / High / Over drive / 50% Flashing /100% Flashing /Strobe

- Quick release rubber strap handle bar/seatpost mount (fits 22-31.8mm)

- Quick release saddle rail mount

- Low battery, charging and fully charged indicator

- USB rechargeable

- Automatic fully charged cut-off system

- Side visibility

- Water resistant

- Size:70 x 19.5 x 12.4mm

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

Switch is a bit fiddly to operate with gloves on and is too easily activated in a pocket or bag.

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

Simple silicone strap and hook system - probably more robust than a light this tiny needs.

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

The best it'll do is 6 hours, which isn't great for a rear light.

Rate the light for performance:

Good all-round visibility.

Rate the light for durability:
Rate the light for weight, if applicable:

Weighs almost nothing, but the penalty is the modest runtime.

Rate the light for value:

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

Tricky - it's a good light, but the modest runtime means it's not great for regular commuters.

Tell us what you particularly liked about the light

Neat looks.

Tell us what you particularly disliked about the light

Poor runtime.

Did you enjoy using the light? Yes.

Would you consider buying the light? No.

Would you recommend the light to a friend? Only if their commute was short.

Anything further to say about the light in conclusion?

Stylish light for extending your ride beyond sundown.

Overall rating: 7/10

About the tester

Age: 42  Height: 5' 8  Weight: er....85kg

I usually ride: Kona Dew Drop, Dawes Century SE, Carlton Corsa  My best bike is: Guess SC1 scandium

I've been riding for: Over 20 years  I ride: Most days  I would class myself as: Experienced

I regularly do the following types of riding: time trialling, commuting, general fitness riding, fixed/singlespeed, Audax and long distance solo rides


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