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Moon Arcturus Auto Pro Rechargeable Rear Light is no longer available at Merlin Cycles. However you may find an alternative or updated product below.
Moon Arcturus Auto Pro Rechargeable Rear Light
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Moon Arcturus Auto Pro Rechargeable Rear Light

This item was discontinued 10th January 2022.

If you require help finding an alternative to this product please contact customer services.

Code:: LAA431-REAR
Moon Arcturus Auto Pro Rechargeable Rear Light
The Arcturus Pro offers fantastic output from a small and lightweight chassis. Combined with an integrated light sensor makes the Arcturus Pro ideal for the daily commute.
  • 1 pce 30 chip rectangualr COB LED
  • CNC aluminium heat sink
  • Integrated light sensor (auto on / off)
  • Auto sfe mode
  • Mode memory function
  • Rechargeable lithium polymer battery 3.7v 300mAh
  • 7 modes
  • low battery, charging and fully charged indicator
  • Auto fully charged cut off
  • Side visibility
  • Water resistant IPX4
  • Daytime flash mode 100 lumens / 14 hours
Lumen Output:
  • Mode1: 15lm – 4.45hr
  • Mode2: 25lm – 2.45hr
  • Mode3: 50lm – 1.30hr
  • FL1: 15lm – 25.00hr
  • FL2: 50lm – 7.30hr


Richard This is my second time purchasing this. My first one fell off while riding after my second time using it and I liked it enough to purchase another one. Quality is great but I’m always worried that it might fall off again so I’m constantly checking to make sure it’s still there.
James Coleman Nice and simple, not too big but reasonably bright light.
DrStrangelove Great battery life. Emergency light tells you when the battery is nearing exhaustion. Easy to interact with. Recommended!
Mr TOKALATSIDIS value for money tail light. Very bright and the flash day is 100lum..Is amazing
William Super-bright rear light. Very well-engineered from high-quality materials.
David Very good performance and impressive options for brackets. Very pleased.
Mr Tóth Neat light. It warns you an hour before depletion, which is a great boon for commuting in the winter months. Wide angle, good brightness. Recommended.
james Extremely bright light with a good quality aluminum body. Good auto functionality and battery life.
Mark Russell Strong and highly visible light with flash modes. Multiple methods of attaching the light to the bike.
jgiedt While the Moon Shield may be brighter, I chose this light because of the wider pattern and the easier operation of 1-button. Nice quality and my eyes still hurt from the few minutes I just spent learning operation. Good mount, though I prefer a seatpost clamp mount over a silicone band. Still seems very secure and easier on/off than grabbing a screwdriver. Good purchase!
Plummer Despite the specs saying it is brighter than the Moon Shield I already own, it doesn't stand out quite as much. Not that it isn't bright - it is plenty bright. It is just that the Shield has a brighter centre. The Arcturus does have a wider field of visibility than the Shield. It's a great tail light.
Mr Vincenzo Fantastic bright light in small package. Very neat for my new roadie
Mr Akkus + Bright enough + Easy to use + Battery can survive a whole day long ride in flashing mode. - Smaller in size comparing to others like Knog but no big deal.
Mr Rutherford This is a very neat and robust light. I was attracted by the prospect of a day time flashing light of 100 lumens which would last for 14 hours before needing to be charged. Whilst it is bright it has a very quick double flash which is off for much longer than it is on. I would have preferred it to be the other way in the interests of being seen. Otherwise it is an excellent product and great value with a terrific array of methods of attaching to the seat post saddle rails or saddle bag.
Mr Aguto One of the best and brightest rear lights on the market. Good quality.
WELLOYAJI Good quality, satisfactory function, easy-to-use attachment, additionally compact size. It is highly satisfactory product. I strongly recommend purchasing this item