I have the Sigma Micro LED lamp appointed me as additional lighting for my bike. It is truly amazing, yet no one is very well thus perceived thanks flashing effect on the roads, especially in the autumn, this is a great advantage.
Although they are not admitted as lighting for bicycles, I use it on my bike, because they are suitable with red and white LED suited for seat post and handlebar and can be stowed nicely in even the smallest pocket when not used.
Pro:
-small and compact
-Easy
-Versatile mounting options
-BLINK Mode
Cons:
-Unfortunately not admitted as the only lighting for bicycles on the road
Conclusion:
Especially for bike / Single Speed / Fixie riders an ideal "emergency", if you are traveling in the dark times - not allowed, but better than completely unseen to drive through the night.