Flowers slowly started developing and looks really promising.
Nonetheless, I was a bit worried about the smell.
But for now it seems to work quite well with my self-made carbon active filter on the outside of the box.
@Zarayju, Sorry for the late answer, I was not checking here frequently.
I've bought those from Lientec-LED. They also offer a lot of DIY-Sets. Keep in mind to also order some aluminum profiles, as the heat of the LEDs needs to be dissipated.