When gods descend to the mortal plane, they must inhabit specially built bodies in order to maintain their presence and hold their aethereal energies. These bodies are built in the aethereal realm with Godtech and made in the image of a human being. Since the essence of a God is so large, the smallest these bodies can be made is in the 8 - 9 ft range. Within the physical form is a large core that contains the god's essence. This core functions similar to a miniature nuclear reactor that powers the body and allows the god to control it like a puppet.
Even with these specialized forms, the gods essence is so strong can't be perfectly contained, radiating from the body in a golden hue. This divine radiation bathes the surrounding area with divine energy, including the sentient beings within that area. Human beings can experience various affects from this aura, including light headedness, extreme pressure, shortness of breath, and unconsciousness. Even heart attacks can occur in certain people, which can be fatal.
These gods need to keep their divine aura at benign levels to prevent it from radiating too strongly from their physical forms, so that it doesn't completely overwhelm the humans surrounding it. Mortals must feel the majesty of their presence without suffering the ill affects. I would also like to keep the God's form as biological as possible, to keep the appeared center of a highly advanced being.
What is the best way to make this happen?