Nothing special has been done in this week, besides watering with some Biogrow + BioHeaven.
At Day 33 I removed the hammer from the plant (which was some additional weight to force it growing as near on the ground as possible) and did some small Defoliation.
@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.