SquareOne Rear Bike Light

High output rear warning light with reflector
Product highlights
  • Motion sensing technology
  • Embedded reflectors
  • Clothing / bag clip included
  • IPX6 Waterproof
  • 6 operating modes

Introducing the SquareOne 40 lumen rear bike light.

Ideal for commuters and road cyclists and a great choice for children's bikes this light has 6 operating modes including steady, flash and daytime flash. .

Works well as an extra warning light for night or daytime use. IPX6 water proofing, smart memory and motion sensing technology this light is packed with features.

At just 41 grams you'll hardly know you have this light attached to your bike, bag or jacket.

Motion sensing technology

Revolutionary motion sensing technology. The SquareOne automatically turns off after 120 seconds when stopped. When motion is detected again the light automatically turns on in the previously selected mode.

Smart memory

Have a favourite mode? The SquareOne rear light remembers the last selected mode next time it powers up. Starting your ride is quick and painless.


Now with EasyClip for quick removal from your bike. EasyClip also works on bags, coats and belts. This light can be used on your bike or wherever you chose to clip it.

Long battery life and fast charging

With an amazing 85 hours max battery life you will always be ready for your next ride. Recharging is easy via a micro USB cable (included).

Operating modes
Mode Brightness Runtime
High steady 40 lumens
Mid steady 20 lumens 5hrs
Low steady
5 lumens 33hrs
High flash
40 lumens 18hrs
Low flash
5 lumens 85hrs
Daytime flash
40 lumens 25.5hrs

Dimensions 40.8mm x 40.8mm x 17mm
Weight 41g
Max lumens 40
Visible from >1000m
Waterproof IPX6
Battery Lithium 680mAh
LED / Bulb Red
Charging Micro USB (cable included)
Manufacturer Gaciron

If you need your lights quickly we offer Express delivery otherwise our Standard delivery takes 2-3 days. All deliveries are trackable and we will send you a tracking number when your order is shipped.

Standard: Free over £50 spend, otherwise £2.99

Express: £1.99 over £50 spend, otherwise £3.99

Like most online stores we charge additional postage to the Highlands & Islands and Northern Ireland. This is to cover the additional cost from the courier.

Read our delivery information for full details.

Lumens explained

What is a lumen?

Lumens measure how much light you are getting from a bulb. The more lumens you have the brighter the light; fewer lumens means it's a dimmer light.

Do lumens matter?

Yes they do however it also depends on the ambient light conditions and which mode you are using. A 10 lumen rear light with a flashing pattern can be more effective than a 80 lumen solid beam at getting you noticed.

How many lumens should my front bike light be?

For general road use between 400 and 1000 lumens is recommended. For off-road use or unlit roads 1000+ lumens is advisable. Just make sure you're not dazzling other road users.

How many lumens should my rear bike light be?

A rear bike light can range from 5 lumens up to 300 lumens. Remember your rear light is about being seen rather than lighting your way. Look out for flashing patterns and breaking modes rather than a super high lumen rating.