ye, get a red spectrum envirolite bulb for flowering, the fan your using is 85 m3h a HPS may build up too much heat for the extraction rate. Youve done an excellent job on the grow room, no cutting corners, Better than mine. What are the dimensions of your room, just out of interest. Also, watch out for hermies when 12/12 is induced, as female seeds are sometimes more prone to hopping the fence