A little bit on rendering and lights. Light rays in a renderer are not like light rays from the sun. Light rays from a renderer do not stop at anything WITHIN THEIR RANGE. That's why they often light up the inside of objects, like nostrils, which would normally be dark. The light continues along the ray and brightens everything in its path...it does not get stopped buy such silly little things as skulls and walls and clothes and hair - even if the hair is hard and not a transparent object.

Ergo, if you have a renderer in which the lights have distance controls, you may use those to cut off the light at a particular distance you decide. For animations- with things in motion; or still pics - with small and hard to identify areas (like nostrils, AGAIN), distance control can still be a real nightmare. For still pictures, you can always touch up in post what you can't control in the render; animators have to find better and more inventive lighting tricks to obtain their goals. Some packages, not Poser, allow for lights to be assigned to specific objects and blocked from specific objects allowing some great freedoms in bringing lighting under artistic control.

Anyway, just remember that renderer rays are vicious. They stop at nothing except a direct command (where the software allows)...pretty much like attack dogs.