yah...im using CGtextures as well..so i can change my skies using dome sky..ive added a light inside the dome sky..and that would be my source of light..

actually when i render, and even i unchecked the default light and hidden lights from vray option..SU sky will still exist, and i dont know how to turned it off..thats why i did used the dome sky to prevent light coming in..and put a NEW light inside the dome..

hehe..