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Monday, 21 November 2011

B&M Lumotec IQ Cyo senso plus T

The Cyo T is much like the 60 lux Cyo, but with a row of four LEDs under the main lens which direct light at oncoming traffic for enhanced visibility

I have replaced my ailing B&M Lyt plus with the catchily-named Lumotec IQ Cyo senseo plus T also made by B&M. There are currently around ten+ variants of the Cyo, including 40 and 60 lux versions (the 40 lux incorporates a reflector which the 60 does not) bottle or hub dynamo versions, near-field lighting versions, automatic on/off via light sensor versions, versions with daylight running lights and either a black or silver finish for some of these models (as discussed previously). 

The Lumotec IQ Cyo senseo plus T is the hub dynamo version of the 60 lux Cyo, with automatic on/off via light sensor and daylight running lights. In this version, the light sensor switches the light between day and night modes. The daylight running lights consist of four LEDs underneath the lens for the main beam. Unlike the main beam which is directed at the road, these LEDs are directed at oncoming traffic as an aid to 'being seen.' During the day the main light beam is at significantly reduced intensity, whilst the four LEDs underneath the lens are all illuminated. At night, the main beam is illuminated to full intensity and only two of the daylight running light LEDs are illuminated, with these two LEDs also forming the stand-light feature in this model.

Whilst I am very happy with the Philips Saferide lamp recently acquired for the DL-1, the unique proportions of the Brompton mean that only a handful of front lights can be fitted without causing problems with the front luggage system. The Saferide is not one of these due to the lack of mount compatibility with B&M fixings (unless modified). Brompton specify either the bottom-of-the-line Lumotec halogen light with the Shimano dynamo wheel or the top-of-the-range (ish) 40 lux Cyo with the SON dynamo wheel. This is perhaps a little unfair to customers, as it suggests that the Shimano dynamo wheel can only power a low end light, despite it being capable of powering the same range of lights as the  SON*. As I discovered, as an alternative option the Lyt can be fitted to a Brompton by using a Cyo mount, although my initial research suggested that this was not common.

In complete darkness the Cyo T provides almost as much illumination as the Saferide. The beam is a bit less wide and the throw seems a little less too. The apparent subjective reduction in throw compared to the Saferide is likely a result of the central bright spot which comprises part of the beam shape. Whilst useful for avoiding potholes (especially so on a small-wheeled bike), the bright spot does make the rest of the beam which is projected beyond it seem less intense than it actually is. The slightly reduced beam width and throw compared to the Saferide is likely being exaggerated in this case by the lower mounting height of the Cyo on the Brompton (~350 mm) than on a conventional bike (~750 mm), but the beam is still entirely sufficient.

Where the Cyo T excels is in its urban-friendly features, such as daylight running mode which to helps mitigate the risk of not being seen by negligent motorists, and the automatic switching between day & night modes via light sensor. The daylight running lights are particularly effective at drawing extra attention in daylight, directing a good amount of light at oncoming traffic. At night, the two lower LEDs which remain turned on are illuminated to a lower intensity, to avoid blinding oncoming traffic. The automatic light sensor can be over-ridden if desired to keep the Cyo T in daylight mode at night. The level of road illumination provided by the light in 'day mode' is sufficient in well-lit areas where being seen may be of more concern than lighting up the road itself, still meeting the minimum standard for a 'proper' light.

The stand-light is different to other lamps I have used. Like the Lumotec Retro, the stand-light is provided by auxiliary LEDs rather than using the main beam as the Saferide and Lyt do. However, unlike any of these other lights the stand-light does not merely stay illuminated until the capacitor has been discharged, it is timed to shut off after around four minutes despite the capacitor having a capacity for a greater length of time. The result of this is that the stand-light is immediately available if the bike (dynamo) is moved again.

The rotary switch on the rear of the Cyo has three settings, off, sensor and daylight mode

Unlike the 40 lux version of the Cyo and the Lyt, the Cyo T does not come with an integrated reflector. A reflector is available for adding to the bottom of the standard Cyo mount, although the Brompton mount is not compatible with this. It is also worth noting that the Torx bolt which comes with the standard Cyo mounting bracket is not compatible with the Brompton Cyo mount due to the different tube thickness. Whilst this set-up has left the Brompton without a front reflector, the daylight running lights are definitely a replacement which is in the spirit of the law even if it does not conform to the letter of it.

The Torx bolt has instead been pressed into service mounting the Lyt back on the Yuba Mundo

I like the Cyo T. In plain terms of brightness and throw, it is not as good as the Saferide, but as I stated in that review, for urban utility riding the beam of the Saferide is overkill. The Cyo T also provides more than enough light for riding along unlit roads. However, the daylight running mode and the automatic switching between day and night modes make this an ideal choice for the primarily urban cyclist, whilst the beam it provides is more than sufficient for riding on unlit roads and paths too. Unless you do a great deal of your riding on completely unlit roads, these extra features probably make the Cyo T the better choice.

*The Brompton SON dynamo wheel could be used to drive a pair of front lights as is fairly common practice amongst SON owners. For typical Brompton usage it is probably not worth the extra cash.


  1. This comment has been removed by a blog administrator.

  2. Plenty of features - sounds like an almost 'fit & forget' solution.

  3. This comment has been removed by a blog administrator.

  4. @Ian,

    It is a pretty ideal fit & forget solution. I'd love another one for the Yuba too (and a hub dynamo, and... etc.

    @paul & nblackthorn,

    Please don't post spam comments, they will always be deleted.


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