its onlp possible in p&p i would say unless you have a stage to light underneath but i still cant see that would work properly.
Why do you want to light the floor independently from the subject?
Rose
the floor will be white, so I need it to be over exposed, but as the subject is laying on the floor, the subject is very likely to be over exposed also.
Ah I see!
Thanks for taking time to explain.
Rosie