StVZO allows only constant lights. No pulsing, no flashing, no special patterns. It is believed that pulsing makes it more difficult to estimate the distance to the light.

To me 10 degrees of visibility from the side seems not enough for StVZO, but I can't tell the correct numbers.

Bicycle lights are only allowed to be used or sold in germany, if they have passed an examination by the authorities. Fines for sellers are significant.