Really cool set up, but why the humidifier? From my understanding, low humidity is ideal. Here's an excerpt from "Growing Autoflower" a book that I love:
You want low humidity for an ideal grow. Try to keep the humidity under 50%. We recommend under 35% in possible. Low humidity discourages growth of molds, fungus, and mildew. It also encourages the plants to produce more resin glands, as they produce the resin glands as a coating to keep the plants from drying out. In low humidity, the plant thinks it is in danger of drying out, so it produces more resin glands.