I bought this light for my Bike Friday New World Tourist which I ordered custom with a Shimano dynamo hub built into the front wheel. It cost 50,34 euro from Bike24. The part of the blurb which sold me on this particular light was:
The Lumotec IQ Cyo light revolution: Dynamo headlight which is up to 500% brighter than required by German road traffic regulations (StVZO)! With IQ-technology for an even and homogeneous beam.
One can recognize a Lumotec IQ Cyo immediately. There is no bulb in the centre of the reflector. Instead, a high-powered LED is used as an indirect light source. One glance into the “empty” reflector makes it clear why Busch + Müller chose the slogan “nothing but light” for their IQ-TEC products. An elegant and concise statement that becomes a genuine sensation after dark: The useable lighted area of the Lumotec IQ Cyo is uniformly illuminated to a maximum extent and twice as wide as with conventional reflectors – simply “nothing but light”.
The Lumotec IQ Cyo features a standlight function with a capacitor. No batteries are required. The standlight function can be switched off by a turn-switch. Wether in the dark or in tunnels the Senso technology automatically activates the entire lighting system when the hub dynamo is in operation.
Any normal 6V dynamo can serve as power supply for the Lumotec IQ Cyo, so it can immediately be installed on any dynamo equipped bike.
Firstly, postage from Bike24 was SLOW. There was much hand-wringing in anticipation of the light’s arrival, as we were running out of time and were about to leave on our tour. The impression out of the box was excellent, though this is my first German designed dynamo-light, and I had high expectations. The light is tough, light, and in my short experience with it, unlikely to be stolen off the bike (to steal it requires an allen key and a small wrench to get it off the fork bracket).
Approx distance from camera: 100 metres, camera height: 30cm (sitting on a retaining wall)
It is much brighter than the $30 battery powered, handlebar mounted LED light that it has replaced, and even compares favorably to my Ayup lights which I had bought to share across a number of my other bikes. While it doesn’t have the retina-burning spot power of the Ay Up lights, the IQ Cyo has a vertical cutoff (so no complaining from oncoming cyclists on a dark bike path – which I sometimes get if my Ayups are pointed on slightly the wrong angle). The IQ Cyo also has a wider throw which means that you have better peripheral vision at night – great for dark country roads where animals (or pedestrians) might leap out at you unannounced.
Water resistance was thoroughly tested on tour and the light passed with flying colours. The standlight function has more than enough capacity for the longest wait at the traffic lights.
I was a bit worried about fork mounting putting the light too low on a 20″ wheeled bike, but it doesn’t seem to be detrimental to visibility, and it has left more room on the handlebars for other things, like my Otek DVS550 camera.
I have been converted to dynamo lights now, after umming and arring about them for at least a year. I have now ordered a dynamo hub (Shimano DH-3N72) and another version of this light (the Lumotec IQ Cyo Plus LED Front Light 175QDi for 46,13 euro) without the senso function for my Surly Long Haul Trucker.
Not much bad to say about this light at all! The only disadvantage was that I had to unbolt it every time I packed the Bike Friday up into it’s travel case on tour. I couldn’t stand the thought of it getting scratched or bashed or squashed while it was still attached to my fork in the case and relatively unprotected.
While the ‘Senso’ function is useful because you don’t have to remember to turn your lights on, I find that I don’t use it. I always turn the light off when I get into the bike cage at work, otherwise it sits there shining until the capacitor is flat, and some ‘helpful’ person will come and turn it off for me anyway.
This light gets a five star rating from me, although I don’t think I need the Senso function. I think dynamo lights are very, very valuable if you want a low maintenance commuter bike – they very rarely fail and you will never have to worry about flat batteries again!