After germination they stayed in the "green house" for the first week, but now under 20/4 light with 2 18W LED strips.
With the lights on, temperature and humidity were in good ranges afaik.
I installed a webcam above the plants that takes a picture every 30 min. which enabled me to create a (somewhat shaky) timelapse video (see above).
They moved to the their (final) 4L fabric pots today, which are filled with a layer of clay balls and "potting and herbal soil" mixed with 10% fresh worm humus.
From now on, lights are switched to 18/6 and I plan to continue watering with 10% worm composter liquid.