For me there is no need to do the long photoperiod at all. I just grow them in normal daylight and water just over the sphagnum creating mini pools of water in the sphagnum and stick the pulling in. They struck 40-50% in two and a half weeks. For pullings with roots I stick them in a vft pot with a water tray an put it in some shade. They grow leaves in two and a half weeks. I found out that the pullings with a "fat" rhizome work best because the ones with a thin rhizome got too wet and became soggy and droopy.
Please correct me if I'm wrong because I only had one go at pullings.