Add to Basket

Leave a review

Close X


Product Description

Blackburn’s Mars 4.0 rear bike light will improve your visibility on the roads. The 1 watt ultra bright red LED is visible over a long distance, while 2 side LED’s increase your peripheral visibility massively - great at vulnerable crossings and junctions. The Mars 4.0 boosts the performance of its main LED by focusing the light through its optic lens.

The compact design delivers 150 hours of flashing burntime with an impressive 50 hour time on constant - great as this runs on replaceable 2 AAA batteries (included). This Blackburn bike light features a tool-less install bracket and is water resistant to stand up to the worst weather can throw at it.


  • Very powerful and compact design
  • Combines a 1 watt ultra bright rear facing red LED with 2 amber side LEDs
  • Light focusing optic lens for maximum visibility
  • Amber side LEDs for visibility at any angle
  • No tool battery installation
  • Powered by 2 AAA batteries (supplied)
  • Versatile mounting system which includes a belt clip, countless bike mounted options and even comes with a rack adaptor
  • 50 hour runtime (steady) & 150 hour (flashing)
  • Compact, fully recyclable, interactive packaging with Try Me feature
  • Blackburn no quibble lifetime warranty

Weight: 0 kg

£5 Off Your Next Order - Review this product to get your voucher code Review

Blackburn Mars 4.0 Rear Flasher Light Reviews

Overall Rating:5 - Rating: 5 / 5
"Awsome Rear Light"
I bought this light some months ago. Used it a few times until September since we had day light almost until 9 p.m. It always looked good.Now day light is shorter and wet conditions arrived. Ive been using it everyday with lots of rain. The light works like nothing can stop it. Very bright water resistent even in down pouring rain.So far so good. Also delivery was fast and the product arrived in neat condition.Thanks Tredz.

Overall Rating:4 - Rating: 4 / 5
"One of the better rear lights"
A very bright rear light.a light that gives you confidence that you will be seen at night or in daylight.Can be adjusted on the seat post.one slight drawback is switching it on whilst riding otherwise I would have given it 5 stars.

How do I apply for finance?

Spend more than £280 at Tredz and you can spread the cost. Pay monthly over 6-48 months, interest free

  1. Fill your basket with everything you want from Tredz and go to the checkout.
  2. During checkout, select the finance option you want as your method of payment.
  3. You will be sent to our finance provider’s secure server to complete your application.
  4. Finance provider V12 will use the information provided to make a decision and complete checkout if you are approved.

How do I get a Cycle to Work bike from Tredz?

It's as easy as 1, 2, 3

If your employer is already running a scheme, you’re just three steps away from receiving your new bike and equipment

  1. Email us with a list of items at info@tredz.co.uk.
  2. We’ll send you a quote within 48 hours, which you pass on to your HR department.
  3. Your employer will order your Cycle to Work voucher. Once you receive it, send to us, then we’ll deliver your new bike and safety equipment.

We accept cycle to work vouchers from all these providers:

UK Delivery Information

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE to mainland UK, regardless of the size and value.

Please note: bulky products and bikes shipped to outlying UK regions are excluded from free shipping - Click here for more info.

International Orders

Country Small orders Bulky orders Large orders / bikes Delivery (working days)
Austria £7.99 £18.99 £29.99 3-4
Belgium £4.99 £14.99 £24.99 3-4
Bulgaria £7.99 £18.99 £29.99 5-7
Cyprus £14.99 £29.99 £89.99 5-7
Czech Republic £7.99 £18.99 £29.99 3-4
Denmark £7.99 £18.99 £29.99 2-3
Estonia £7.99 £18.99 £29.99 4-5
Finland £7.99 £18.99 £29.99 3-4
France £4.99 £14.99 £24.99 2-3
Germany £4.99 £14.99 £24.99 2-3
Greece £7.99 £18.99 £29.99 4-5
Hungary £7.99 £18.99 £29.99 3-4
Irish Republic £4.99 £14.99 £24.99 2-3
Italy £7.99 £18.99 £29.99 2-3
Latvia £7.99 £18.99 £29.99 4-5
Lithuania £7.99 £18.99 £29.99 4-5
Luxembourg £4.99 £14.99 £24.99 2-3
Malta £14.99 £29.99 £89.99 4-6
Monaco £7.99 £18.99 £29.99 2-3
Netherlands £4.99 £14.99 £24.99 2-3
Poland £7.99 £18.99 £29.99 3-4
Portugal £7.99 £18.99 £29.99 3-4
Romania £7.99 £18.99 £29.99 4-5
Slovenia £7.99 £18.99 £29.99 4-5
Spain £7.99 £18.99 £29.99 2-3
Sweden £7.99 £18.99 £29.99 3-4

Easy Returns

Simply return the items to us in their original, resaleable condition, and securely packaged, within 365 days of receipt.

Collect Plus

Easy as one, two, three

For items under £75 and 10kg, you can use the Collect Plus service by printing your label off online and dropping your package off at a local store.

Step one - Repackage your item and include a returns form

Step two - Buy and print a returns label

Step three - Take your item to your local shop, pay your £4.49 and get a tracking receipt

Tredz Online Sales, Castell Close, Swansea Retail Park, Llansamlet, Swansea, SA7 9FH
E-mail: sales@tredz.co.uk | Tel: 01792 799508