Plant really develops great for this circumstances and the given space. The flowers are getting thicker and the Leafs nearby getting more trichomes :)
I started increasing the nutrients at the beginning of this week.
@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.