Light:
For the first 10 days I'm using a 26w daylight CFL-bulb (Sunny LifeLite). Unfortunately, in the beginning the bulb position has been too far away from the plant (20cm), so the seedling had to stretch a lot to get to the light. Since the bulb is hanging about 3cm above the plant.
Ventilation:
My fan (Prima Klima EC 125-TC) seems oversized for the small box, but it runs silently and currently consumes only 3W.
Humidification:
There are water containers with evaporative fleece around the pot. By the strength of the air flow, humidity (70-80%) and temperature (23degrees) can be well regulated.
Watering:
In the first week the seedling doesn't get water, the soil being covered with aluminum foil so that it does not dry out.
Power consumption:
26-28 Watt, 18 hours per day