Why are you interested in these information?
It is not sufficient to have a light according to the german laws. You (if you are an producer/distributor) also need to bring the light to an office, where the the "correctness" is checked and where you get a specific number for the light (something like ~~K"some digits" or so) that is marked on the bike products sold with the label "according to StVO". Your light will not be "legal" without that number, even if the electrical and light specifications are according to the law.
However: In practise I never heared from a Police man being so fixed on the law, in particular in case of a foreigner. They are happy if you have (sufficent) light at all.