Like this site? Help us to make it better.


Cygolite Hotrod 50 USB



Versatile and very powerful light, but peripheral punch is good rather than great around town

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.

What the scores mean

Good scores are more common than bad, because fortunately good products are more common than bad.

  • Exceptional
  • Excellent
  • Very Good
  • Good
  • Quite good
  • Average
  • Not so good
  • Poor
  • Bad
  • Appalling

The Cygolite Hotrod 50 USB rear light is a super-sleek model that performs remarkably well in all conditions thanks to six intelligent settings and largely generous run-times.

The Hotrod looks very similar to Moon's Comet X Pro, and the specification isn't too far different from this and similar 'strip light' patterns. Only the fussiest of clutter-phobic riders could claim the Hotrod spoilt their bike's clean aesthetic – even when it's positioned on a pencil thin seatstay, let alone a 27.2mm seatpost.

> Find your nearest dealer here

> Buy this online here

Behind the composite lens, there are no fewer than 20 diodes sharing the same circuit board, protected by a thin aluminium heatsink and fuelled by a fit 'n' forget lithium-ion cell. This is reckoned good for 500 charge cycles before run-times are adversely affected.

COB (chips on board) technology is increasingly ubiquitous, and I'd expect nothing less from this price-point. Frankly, it's a winner all-round.


The Hotrod affixes to seatpost or stays via a sturdy rubberised strap, which achieves leech-like tenure around most surfaces and sizes. That said, some gentle pre-stretch was called for when fitting to an oversized 31.6mm model, although a root round in the bodge box confirmed others will work pretty convincingly. A clothing clip for bag loops would have been a nice touch but hardly a deal-breaker.


Cygolite doesn't cite an IPX rating, simply describing the Hotrod as water resistant. If you are regularly riding in foul weather and shunning mudguards, a quick lick of silicone grease on the port plug might be a wise move. Otherwise, there's been no problem on rainy rides; I've given it the odd provocative blast from the garden hose and left it in-situ during sudsy bucket washes.


This is a little button type on the right hand side, which is marginally easier to operate than the Moon Comet X Pro's and Cateye's Rapid X, especially in full-finger gloves. Nonetheless, it requires a definite two-second press, so unwanted engagements are going to be in blue moon territory. With a bit of practice, I was able to reach behind and staircase up/down to suit conditions, say when passing from sticks to suburbs.


Zero to hero fuel-ups take a full three hours from the mains, another 15-20 minutes from portable tech. That's loosely what I'd expect from models of similar capacity. I also like the low battery warning indicator, which sends a visual alert when turning on/off, greatly reducing the likelihood of being unexpectedly plunged into darkness.


These are broken down into day, day and night, and night specific, although judging by some very cold and murky mornings, all seem very conspicuous. As we'd expect at this end of the market, there's a memory function for press and go convenience.

Performance in all modes is genuinely impressive. Aside from Group and Low Flash, all the settings are quite visible during daylight (and foggy morning and evenings have been pretty consistent during the test period).

Cygolite Hotrod 50 USB - high steady overcast.jpg

High Flash

At 50 lumens this is less aggressive than the Comet X Pro, but, with the exception of really foggy days, more than bright enough for most conditions. It's a very bright red beacon – I've spotted other people's at a good 200 metres when driving along dual carriageways on grey mid-mornings. Run-times have been a consistent 3hrs 24mins, within 6 minutes of those quoted.

High Steady

I was surprised to discover this is only 30 lumens – especially given the comparatively average if genuinely faithful 1hr 30min run-time. On misty nights and along unlit roads, other riders reckoned they could pick me out from 250 metres. Judging by braking distances and gear selection, car drivers did so at similar distances. This deterred wheel sucking, though seemed to encourage hasty overtaking.

Cygolite Hotrod 50 USB -  side view high steady.jpg

In suburban stretches, presence is still excellent – at least from behind – but less efficient than SteadyPulse or Zoom.

Low Flash

This is a super-frugal setting that Cygolite cites as being suitable for day and night. Lumens aren't mentioned, but judging by others in my collection, I'd say in the region of 15. This hits the sweetspot on many levels: just bright enough for daylight, it's perfect for those early season afternoon rides that can last beyond dusk.

It's distinctive enough through the concrete jungle too, without being irritating to others in slow-moving rush hour traffic. Visibility is a very reasonable 130 metres along unlit lanes, maybe slightly further on clear nights, 100 through town.

Better still, it'll blink away for almost 30 hours between charges. That said – and this is something that goes for other slimline designs – peripheral punch is better in higher/more up-tempo settings. Low Flash pulsed just a little too slowly for my liking when tackling some roundabouts and ring roads.

Zoom and SteadyPulse

These seem to burn at identical intensities and consume similar reserves, close to the six hours quoted. Zoom is more distinctive in congested traffic, whereas SteadyPulse is a clever hybrid and designed to keep us on the radar while making it easier for drivers to gauge our speed and, thus, approach/overtake.

Anecdotally, it seems to work very well, especially in semi-rural contexts between dusk and dawn. After dark, the arc of light is actually much better than profiles would suggest, providing some extra presence and extending its scope.


As its name suggests, this mode is designed with social riding in mind, and is claimed to run for 100 hours between charges. I say claim because I've not reached that milestone as yet – well past the 70-hour mark, mind, with no hint of a flicker. No figures are quoted, but using Cateye's Rapid Micro Rear as a gauge, around 10 wouldn't be far out. In group settings, there's safety in numbers and less need for a retina tickler.

> Buyer's Guide: Rear lights – make sure you're seen, day and night

I've really enjoyed using the Hotrod's intelligent modes, and in some respects it could easily be the perfect 'one rear light for all occasions'. However, urbanites and those who regularly mix things up should probably think about running a second rider/luggage-mounted model for reinforcements. In spite of 180/220-degree projections, I've tended to consider these strip-light designs as optimal for open road riding and paired them with a cheaper helmet-mounted unit with bigger lens area.


Versatile and very powerful light, but peripheral punch is good rather than great around town test report

Make and model: Cygolite Hotrod 50 USB

Size tested: 50 lumens

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?

Cygolite says:

- Powerful 50 lumens flashing

- Low profile, compact size

- USB rechargeable Li-ion battery

- Low battery indicator

- Water resistant design

- 1:30 ~ 100 hr run time

I say, it's a bright, intelligent rear light that is easy to live with and extremely frugal in some settings.

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

6 modes: High Flash - SteadyPulse® - Zoom - Group - Low Flash - High Steady

- SteadyPulse's steady beam helps motorists better gauge their distance from you while the overlapping pulses keep them alert of your presence

- Sturdy and flexible Versatite™ mount attaches to most seat posts and seat stays, including aero styles

Patent pending

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

Firm but user-friendly side-mounted switch, easily operated wearing full-finger gloves.

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

Secure and dependable on most diameters of post.

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

Generally very good, although in common with similarly powerful competition, the highest steady mode guzzles reserves with alarming ease.

Rate the light for performance:
Rate the light for durability:

Aluminium heat sink gives the diodes a sporting chance of long and productive lives. Battery reckoned good for 500 charge cycles before run-times are adversely affected.

Rate the light for weight:
Rate the light for value:

Not cheap, though competitive among similarly sophisticated models.

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

Overall, a sophisticated and powerful light designed for all conditions. Though certainly good around town, it's most visible out on the open road. In keeping with several similar priced and powerful competitors, short run-times mean the high steady setting is of limited use.

Tell us what you particularly liked about the light

Sleek, powerful and very effective, night or day.

Tell us what you particularly disliked about the light

High steady setting's modest run-time. A clothing or bag clip mount would be nice.

Did you enjoy using the light? Yes

Would you consider buying the light? Possibly

Would you recommend the light to a friend? Yes, a worthy contender for sleek bikes and long, steady miles on the open road.

Use this box to explain your score

It's a capable light with some very frugal settings, but better suited to open roads rather than town-centric riding.

Overall rating: 7/10

About the tester

Age: 43  Height: 1m 81cm  Weight: 70kg

I usually ride: Rough stuff tourer based around 4130 Univega mountain bike 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)

Add new comment


PaulCee52 | 7 years ago

I have the '30' version of this, which I use as a regular light and, also, as an extra light on my TT bike for evening events, where it's only about the same width as the aero seatpost...

Latest Comments