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Blackburn DayBlazer 400 front light



Versatile and compact light that suits suburban/urban riding, though run-times aren't generous on higher steady settings

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Blackburn Dayblazer 400 is the baby of the range. It's bijoux enough for clutter-phobic bars, and although 400 lumens are top whack, and run-times aren't particularly generous in the lower 200-lumen setting, the strobing and flashing modes have ample presence and reasonable economy, which might appeal to urban riders.

  • Pros: Inexpensive, compact, decent flashing/strobing modes
  • Cons: Short run-times in constant settings


The Dayblazer 400 uses TIR optics that project a combination of spot and flood beam, providing light to navigate and be seen by. It has a composite body and cowling, but build quality is reassuringly solid and it complies with IP67 for waterproofing, meaning it can endure immersion in a metre of water, for 30 minutes. Suffice to say it has passed my bucket and hosepipe torture tests with flying colours.

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It also conforms to ANSI FL1 standards, which test output and accuracy of claims, including run-times. To my surprise, it also complies with the 1 metre drop test.

Unlike its bigger relations, the 400 is fuelled by a lithium polymer battery. This charges in around three hours via a super-convenient Micro USB cable. Mains refuelling will shave 20 minutes or so from this. Either way, the integrated 'fuel gauge' battery life indicator will turn green when it's good to go.


There are four modes in total: Blitz is 400 lumens, Low 200, pulsing and strobing are 200 apiece.

Using the full 400 lumens unleashes a very pure, accurate hybrid beam. After dusk, the spot provides ample detail for navigating better-lit semi-rural sections at a steady 17mph. In such settings, oncoming traffic dipped their headlights at around 25 metres, maybe less.

In a pinch, there's just enough bite for canal towpath cut-throughs, and I've also found it handy for darker suburban stretches where I've been able to maintain a steady 23mph with ample warning of upcoming/potential hazards.

It's overpowered for town perhaps, but not overbearing in slow-moving, congested traffic should you forget to switch down. However, I've only managed to get 58 minutes from a full charge; okay, that's just 2 minutes short of those cited, so acceptable, but it's only really suitable for short runs.

Blackburn Dayblazer 400 Front.jpg

Low will last for almost 90 minutes, and is about right for the concrete jungle, the lens projecting a wide arc of very pure light that proved most beneficial at roundabouts and junctions.

However, since the main consideration in these contexts is being seen, I've found the pulsing mode more effective. The gentle strobe is very subtle and bright enough to navigate the outskirts of town, with other traffic tending to note me earlier than its steady counterpart – around 25 metres compared with 15 metres.

Run-times are also more realistic for commuting, or on those occasions where you've been enjoying some extended late summer evening playtimes on the best bike. Ours returned 5 hours 57 minutes from a full charge, which although not jaw-dropping is very practical for shorter/middle distance commuting.

It has sufficient punch for daytime too: other traffic seemed to take notice from 40 metres along open roads, 20-25m around town.

> Buyer's Guide: The best 2018 front lights for cycling

Strobe is very distinctive and reminded me of lightning and is extremely conspicuous. We're talking a good 150 metres along country roads, 90 or so through built-up areas; I've found this mode and the light's modest proportions a very welcome complement to dynamo lamps. Run-times are cited as 10 hours and it's returned 9 hours 56 minutes from a full charge, which is refreshingly frugal.


The centre-mounted switch is intuitive to use, even in gloved hands, and very positive, so unintentional engagement is highly unlikely.

The integrated battery life indicator gives a clear visual account at the point of selection, so despite the lack of auto 'idiot' kick down, being plunged into darkness should be a rare event. Green indicates you have between full and 75%, orange 75-25%, red less than 25%, and at around the 10% marker it will pulse intermittently. At this point, bargain on 15 minutes before it powers down – useful as a failsafe, particularly when helmet-mounted, but here's when an auto kick down would come into its own.

Mounting hardware

There are two choices: bar or GoPro type helmet mount. Switching between them is simply a matter of unscrewing one from the lamp body and threading the other in place. The swivelling design means whipping it on/off the bar is quick and hassle-free. Ours has fitted standard and oversized bars/extensions with ease. If you're going the helmet route, it might be worth checking compatibility first.


Allowing for the modest run-times in steady modes, the Dayblazer 400 represents very good value for money.

If you're seeking a compact, tuneable and inexpensive model, this will serve you well. If you want to navigate unlit semi-rural/rural roads with regularity, you should look to something more powerful, with run-times to suit.


Versatile and compact light that suits suburban/urban riding, though run-times aren't generous on higher steady settings

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Make and model: Blackburn DayBlazer 400 front light

Size tested: 400 lumen

Tell us what the light is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Blackburn says, "Not too long ago a 400 lumen headlight for this price would have been a pipe dream, but now the DayBlazer 400 is a dream come true! Featuring eye popping BLITZ daytime running mode to grab the attention of cars, IP-67 submersability and ample side visibility, the DAYBLAZER 400 puts light where riders need it most"

My feelings are that it's a reasonable town/contingency lamp with plenty of charm and decent spec for the money. However, relatively short run times in the steady settings limit the appeal beyond city limits.

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

Meets ANSI FL-1 Standard

This standard was created by the American National Standards Institute (ANSI) to provide consistent performance measurements for handheld lights. Although bicycle lights are not required to follow this or any standard, Blackburn believes in offering full transparency in how the output, run time, water resistance and other performance claims are measured.

* Excellent Side Visibility

Built in design features channel a bright hit of light to each side providing visibility to cross traffic.

* LED Fuel Gauge/Charge Indicator

A small built in LED light indicates the battery level. Green = >75%, Orange = 75-25%, Red = <25%

* Micro-USB Rechargeable

Charges via any standard USB port.

* Universal Mount

Action camera style mount, that fits most helmets and handlebars from 22-35mm in diameter.

* IP-67 Waterproof

Ingress protection rating or 'IP Rating,' is a techy way to describe the level of water and dust proofness a product has. This light meets the IP-67 Standard, which means it is totally protected against dust/grit and is fully protected against the effects of immersion between 15cm and 1 meter for 30 minutes.

* TIR Lens

DAYBLAZER lights feature Total Internal Reflection (TIR) lenses that efficiently focus the light beam with a hot center and cool edges that allow the rider to see clearly down the road.

* No tools required

 Lithium Polymer battery

 Waterproof to IP-67 standard

 3 hour recharge time

 LED Charge Indicator

 Runtime: BLITZ 1hr (400 lumen), Low 1.5 hrs (200 lumen)

 Runtime Pulse/Strobe: 6hrs (200 lumen)/10 hrs (200 lumen)

 59g

Rate the light for quality of construction:

Resin construction but doesn't feel flimsy or low rent.

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

Top-mounted switch is easily located and operated, even in gloved hands, but still positive – so accidental power-ups in pockets or luggage should be rare.

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

Intuitive to use and compatible with most hosts.

Rate the light for waterproofing. How did it stand up to the elements?

Passed my usual tests (including hosepipe) without missing a beat.

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

As always, it depends on how you're using it. Pulsing and strobing are the best options, since 200 and 400 steady modes aren't very generous or practical unless you're doing very short runs, or prepared to charge religiously.

Rate the light for performance:

Very effective in terms of presence and being seen, especially in the pulsing and strobing settings.

Rate the light for durability:

Seems sturdy enough, particularly given the composite construction and price point.

Rate the light for weight:

Sufficiently light and compact for best bikes.

Rate the light for value:

Remarkably good, compared with other torch type designs, although there is some trade-off when using the steady settings, which deplete the battery very quickly.

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

Overall, and as a commuter/contingency lamp, the Daybright has been pleasant to use. The pulsing and strobing functions are arguably the most useable and the former's oscillating speed is slow enough to navigate by – at least through suburban stretches – as well as making your presence known: distinctive enough to attract driver attention, especially in slow moving traffic. Strobing is arguably the most frugal, not to mention captivating. Provided you weren't needing 400 lumens with any regularity, it could be a really useful, wallet-friendly commuting/contingency system or dynamo companion.

Tell us what you particularly liked about the light

Build quality (relative to price point), compact design, frugal pulsing/strobing modes.

Tell us what you particularly disliked about the light

Short run-times in 400 and 200-lumen steady modes.

How does the price compare to that of similar products in the market, including ones recently tested on

Favourable, compared with other designs of this kind, boasting similar outputs.

Did you enjoy using the light? Yes

Would you consider buying the light? Possibly

Would you recommend the light to a friend? Yes, as a dynamo companion, or for town biased commuting.

Use this box to explain your overall score

It's an inexpensive and well-made compact light that is quite versatile, provided the 400 and 200 lumens are used sparingly.

Overall rating: 7/10

About the tester

Age: 45  Height: 1m 81cm  Weight: 70kg

I usually ride: Rough Stuff Tourer Based around 4130 Univega mtb Frameset  My best bike is: 1955 Holdsworth Road Path and several others including cross & traditional road

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: cyclo-cross, commuting, touring, fixed/singlespeed, mountain biking

Shaun Audane is a freelance writer/product tester with over twenty-eight years riding experience, the last twelve (120,000 miles) spent putting bikes and kit through their paces for a variety of publications. Previous generations of his family worked at manufacturing's sharp end, thus Shaun can weld, has a sound understanding of frame building practice and a preference for steel or titanium framesets.
Citing Richard Ballantine and an Au pair as his earliest cycling influences, he is presently writing a cycling book with particular focus upon women, families and disabled audiences (Having been a registered care manager and coached children at Herne Hill Velodrome in earlier careers)

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