Ghost of NYC (Humboldt Seed Organization

I moved this girl into her new home. 2 x 4 room with DIY light that I figure to be around 200 watts. I am trying to establish a perpetual grow. I smoke way too much weed. Now... I have no idea that PPFD is accurate. I take readings with a free phone app. It reads around 700 PPFD. Whether it's right or wrong, it is a baseline and the plants, that I have grown so far seem to enjoy the PPFD (my reading) to be anywhere from 700 to 800 PPFD during Veg. I slowly bump up as I approach Flower. Just lotus nutrients as directed and diluted down to around 850 ppm. Some leaf picking. I want to flower in approximately one week. I am very nervous to see how my DIY light works. I know I need another light. Just no funds. Maybe Santa? I water when they are dry and feed every other time. I am just trying to give them what they need and want. Mild mixture of neem oil and water, sprayed at night (probably every 5 days) as PM (preventive). Wild fluctuations in humidity (creation of microclimate, and weather). I also, see no way around purchasing a dehumidifier.