I bought a Supernova M99 Pure+ (12V) for 150 Euro. Had to solder my own connector though...
Light is excellent(!) in comparison to my other bike lights.
Is it worth the money? Hard to tell. I say that one accident is significantly more "expensive" than buying a good light.
People beleivve that ridng 45km/h can be done with cheap standard bike quality, because from time to time they ride 45km/h downhill with such bikes. I do not agree here and would say that it is very dfferent if you ride 40km/h+ 1% of your time or 80% of your time. I would argue that sPedelecs need much more durable technology than is found on most standard bikes. Tires, fork, light, frame, everything relevant for safety has to be bought from high or even highest quality, imho.