I've got some seedlings, 3x Northern Lights under 110W CFL + some 20W CFL bulbs, hanging 25 cm (+- 11 inches) above the plants.
The EC seems fine, runoff is lower than 1.0 mS/cm when I give 1.0 mS/cm water, runoff pH is 6,5 and I give rain water with a pH of about 6,2. Temperatures stay...