Tips for Using and Animating Lights
When you’re lighting a scene, invoking a lighting mode in your Perspective or Camera view panel will give you great feedback regarding the relative brightness and direction of your lights. Most computer system’s graphics cards can handle a maximum of eight lights in Lighted mode; some professional cards can handle more.
You invoke Lighted mode by pressing the number 7 on your keyboard (not through the number pad on the side). You must first be in Shaded mode (press 5) or Texture mode (press 6) for Lighted mode. Remember that Lighted mode displays linked lights as if they’re lighting the entire scene. This can cause some confusion, so it’s wise to take notes on any light linking in your scene.
Maya’s IPR renderer ...