Every so often I buy something that actually exceeds my expectations. When this happens it is particularly pleasing because, being an anorak, I like to research my options thoroughly.
I've just received my christmas present to myself - a B&M Cyo light which I've wired to a B&M S6 dynamo. It is the 40 lumen model which I believe isn't being imported by Amba (I heard they are only importing the 60 lumen version) so bought it from starbike.com.
I believe the 60 lumen model has the same bulb/brightness but a different lens. The 60 lumen gives a longer beam but a black spot close in whereas the 40 illuminates all the ground from front wheel forwards but not quite so far ahead. At least, that is my understanding and doubtless someone will correct me if I am wrong!
I went for the 40 'cos I am not a fast rider - and don't need to see half a mile down the road and would rather see all potholes/obstacles until I pass them.
However, I am completely amazed by the performance of this light. It is, literally, brilliant with an excellent distribution of light, right where you want it. Even my mate who is tighter than a tight thing is interested in getting one - and that, if you knew him, says everything.