Moon Sirius intelligent rear light

£37.49  £49.99

Black and Red



Dispatched between 15th Jul and 16th Jul, if ordered before 2:00pm tomorrow.
Part Number:




The Moon Sirius intelligent rear light is constructed from a CNC Aluminium heat sink casing equipped with break & light-sensitive technology, meaning it works like a car light. The case features a built-in reflector making it highlight you even when it's not turned on. Day flash Mode, light memory mode and side visibility make it easy to stay safe. USB-C rechargeable and Quick release universal bracket add perfect elements of convenience.


  • Intelligent operation: Motion-sensitive & Light sensitive
  • Reflection (built-in reflector)
  • Break Sensor
  • Auto safe mode (Around 1hr)
  • Day flash mode
  • Light mode memory
  • CNC Aluminum heat sink casing
  • USB-C rechargeable
  • Quick release universal bracket
  • 2 O-rings for mounting:
  • RS-G(fits 20-35mm diameters)
  • RS-H(fits 35-52mm diameters)
  • Low battery, charging & fully charged indicator
  • Automatic fully charged cut-off system
  • Side visibility
  • Water resistant (IPX 7)
  • STANDBY TIME: 500hrs
  • Variable lumen system
  • FL-1 tested lumen
  • FL-1 tested runtime

Mode: Output, Runtime

  • DAY FLASH: 150lm, 13hr
  • MODE 1:30lm, 2.4hr
  • MODE 2: 60lm, 1.2hr
  • FLASH 1: 30lm, 14hr
  • FLASH 2: 60, 11hr

This light is great for commuting if you want something that's for long rides Consider the Pro version

Bike Lights - How Many Lumen Do You Need?

Bike lights are rated in Lumens. A Lumen is the measurement of the total visible light emitted and is commonly used for all kinds of bulbs.

One thing worth noting is that most lights advertise their headline rate. Packaging may say 1000 lumens. Reading the small print they might only do that for an hour. That light may run 500 or 600 lumens for 2 or 3 hours. So it's worth buying a light with more lumens than you need to get decent running times.

There is no fixed agreement on how many Lumens you need for a bike light as it depends on the type of cycling you are doing. As a rough guide we say that:

  • Daytime running lights = 100+ Lumens
  • Urban commuting lights = 50 to 200 Lumens
  • Rural riding lights = 400 to 600 Lumens
  • Trail riding lights = 600+ Lumens

Price Match at Cycles uk

We understand that price is important, so we regularly price-check our competitors to make sure we have the best offers available. We recognise that we will not always be the cheapest, so if you see the same product cheaper from any of our competitors then please get in touch via the form below and we will do our best to match any reasonable advertised price.

Colours Black and Red
Sizes N/A
Brand Moon
Model Year 2020
Barcodes 4897029984833
SKUs / Part Numbers AW20 MOON SIRIUS

Please note: Manufacturers can sometimes change the specification of the products from time to time.

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