Viperspectra xs2000 bahama mama s1

Everything is going good.im about to start using nutrients again.they are growing slow but they going.its just so dry in my grow room.30%humidity.i even have a good humidifier.i think this is why they are growing slow.im keeping my light at about 30 percent right now.which is about 150 ppfd.im just hopeing to see some real growth in the next week or 2.