The first and most important aspect of any rear light is the visibility that it provides to other road users. In this regard the Sentinel excels, pumping out 30 lumens from a small and relatively lightweight rear light.
The light has four different settings, with two steady beams and two flashing options. I found that each worked effectively and I had a couple of cyclists behind me comment on how bright the light was. The light settings and the laser (which has a solid or flashing setting) are set by two buttons on the top of the light. I did find the buttons a bit awkward, especially when trying to use them with full finger gloves, mainly because they are right next to one another.
The standout feature of the light is the lasers that create a 'virtual lane'. Initially I was sceptical about how effective these could be, but they do provide good additional visibility.
I'm not so sure about the 'virtual lane' though. If the idea is to create a safe passing distance, then it would not be a wide enough lane for me to feel safe as the lasers project lines on the road that are only around 1.5 feet either side of the bike. However, it does make you seem bigger on the road and drivers did seem to give me a wider berth than usual.
The width is naturally dependent on the height at which you have the light on your seat post, which attaches through a hand tightened clamp. This worked effectively and the rubber inner surface of the bracket kept any surfaces from getting scratched. Surprisingly, the light works just as effectively when attached to a saddlebag: the lasers manage to maintain stability thanks to a strong clip.
Charging is a breeze and uses a micro USB cable that powers from 0 to 100% in around two hours. The battery lasts for varying times based on how you are using it. The settings that I generally used (flashing lasers and flashing lights) meant that it lasted for around 10 hours, which meant charging it once every couple of weeks for my commute into work.
In terms of weight (73g is claimed) the road.cc scales of truth came in at 93g, so it is not overly heavily, but isn't the lightest rear light on the market.
At £44 it is expensive for a rear light, but it does have impressive illumination and the lasers certainly add an extra dimension of visibility.
Good rear light with lasers that add visibility if not necessarily virtual lanes
road.cc test report
Make and model: Niterider Sentinel USB rear light
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?
The light is aimed at safety conscious cyclists in urban environments. Given that it does provide a considerable visibility on the road, I think that it does work in this regard.
Tell us some more about the technical aspects of the light?
Ultra bright Laser Lanes
Powerful 2 watt LED
Rechargeable Lithium polymer battery
Rate the light for quality of construction:
Sits strongly in the mount and construction is of good quality. One issue is the proximity of the buttons, making it slightly awkward when turning lights and lasers on and off.
Rate the light for design and ease of use. How simple was the light to use?
Easily to attach to the bike, the lasers are simple to use, but again, the button placement does make it slightly awkward to operate.
Rate the light for the design and usability of the clamping system/s
Very easy to put on the bike using either the bracket or the hook to attach to saddlebag.
Rate the light for waterproofing. How did it stand up to the elements?
Stood up well to elements, used it in cold and wet conditions without any concerns.
Rate the light for battery life. How long did it last? How long did it take to recharge?
Good battery life and a flashing pattern that can be changed in order to prolong battery life.
Rate the light for performance:
Very bright light that works well, the lasers may not necessarily create a virtual lane, but they certainly increase visibility.
Rate the light for durability:
No worries with durability, seems like it would outlast cheaper options.
Rate the light for weight, if applicable:
More or less middle of the pack.
Rate the light for value:
Expensive, but with added brightness and lasers the additional money doesn't seem too excessive.
Tell us how the light performed overall when used for its designed purpose
Performed well, I certainly noticed cars making extra room for me on the road.
Tell us what you particularly liked about the light
The brightness was a really strong point and I also liked the additional lasers, they certainly added an element of visibility to the lights.
Tell us what you particularly disliked about the light
The buttons at the top are too close together, making it hard to operate with either thick gloves or freezing hands after a long cold ride.
Did you enjoy using the light? Yes.
Would you consider buying the light? Yes.
Would you recommend the light to a friend? Yes.
Anything further to say about the light in conclusion?
A strongly-performing backlight with the innovative element of lasers that may not create a perfect 'virtual lane' but certainly add an extra level of visibility.
Age: 27 Height: 6 ft Weight:
I usually ride: Cannondale Supersix Evo 6 My best bike is:
I've been riding for: 5-10 years I ride: Every day I would class myself as: Experienced
I regularly do the following types of riding: commuting, club rides, sportives, general fitness riding,
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