Presumably many of those interested in dynamo LED lighting are familiar with the review page by Wouter H. Scholten. On that page the blasts the IQ Cyo lamp with the near illumination, while touts the new Philips Saferide LED dynamo lamp.
I have been riding with IQ Cyo for over 2 years now and have been very happy, but strong claims of superiority of another lamp arose my curiosity. Well, the Saferide arrived yesterday and I have, so far, been able to compare the Cyo and Saferide when powering them either in parallel or separately from a 6V battery. To sum up, so far I am not impressed by Saferide.
One aspect of the beam that I find essential for city riding is a tall column of illumination provided by a lamp, with intensity changing monotonically. The main patch provide by Saferide is shorter than for Cyo. There is a gap underneath the main patch and then the illumination recovers a bit. Otherwise, the beam of Saferide is much worse defined than for Cyo. There is plenty of light scattered randomly to the sides in the form of patches and combs. In my experience, this may, on one hand, be quite distracting, and, on the other may help improving side visibility. Finally, curiously within the main illumination area Saferide is dimmer than Cyo. Obviously, 6V battery is not meant to be the main source for those lamps, but at least under some power conditions Saferide turns out to be dimmer. The width and general outline of the main illumination are appears similar for Saferide and Cyo apart from this bottom of the beam issue.
Technically, Saferide utilizes two LEDs while Cyo one. The front of Saferide is completely transparent, while Cyo's is partly transparent and partly turned into a reflector. At least with the power I have been utilizing, the Cyo's standlight is well brighter that that of Saferide.
My comparison of lamps in practical use may need to wait a bit as I need to concentrate first on an unrelated electric power issue on my bike.