Blue Cheese S.O.G.

S.O.G Method: I will be growing 15 plants from seed. All of them are Blue Cheese from Dinafem. Light: Considering that they will veg just for 3 or 4 weeks, I use directly HPS 400w Phillips SON-T. 20 hours light. Ventilation: I have a powerfull extractor running in line with the light, and a strong fan inside pointing directly to it so temperature is controlled even the hottests day. However, autumn is coming. In adittion I have an intractor and 2 soft fan pointing the plants.