Okay .. ghost lights are the answer but still ... I like to hear what is problem here.
Those titties are probably not only causing a solar eclipse, the gravitational pull they are causing is more than likely creating a vacuum in time and space.
But giant titties aside.
Basic lights that are up and they came up with the room (roof).
Okay .. ghost lights are the answer
Don't is the answer to the first one and not really is the answer to the second one.
The lights that come with assists are designed to make the promo render look good, they are useless for rendering a character, hence why you never see a promo scene with a character in it.
Get this -
https://f95zone.to/threads/iray-light-manager-pro.9146/
Where you see the white bar called lights color, just change it to black and will kill every light in the scene. Issue is, DAZ characters need a light source directly on them, not near them or around them, directly on them, their skins are designed to react to the light.
Google DAZ three point lighting and/or DAZ emissive planes (I prefer the latter), I can't point you a tut because i worked out emissive planes before I saw any tut, so I don't know which is good or not. Weather you use a spotlight or a plane the trick is, do not put the light directly on there face, angle it across and down, that's how you get the shadows.
Ghost lights are only used to light up areas behind the characters to make the scene brighter, not to make the character look any different (it can, but don't rely on it).