Also another question i need an answer for but it has to be precise please. How far away should the light bulp be from the plants so they dont get burned cause i just noticed one of them got some litlle yellow spots on it's fan leaves which are starting to form a hole. I got a hygrothermo sensor just 2 inces higher than the tallest plant and it's maximum temp it reads is 81.8. the ventilation is carefully set up. I have 2 cpu fans 12mm (1000rpm) inhaled air and 2x 1800rpm fans (12mm) exhale. and it's working great.