When you create a light, it is automatically added to the center of a scene. A light’s default options determine how the light affects the scene and whether or not it casts shadows, but you can (and typically do) change most of these options on a per-light basis by adjusting the light’s attributes (see Adjust a light source’s attributes).
You can make a one-time change to the default options of a type of light before you add the light, or you can adjust the options to change the way all subsequent lights you create look and work.
To set light options before you create the light
For a description of the light options, see the following for the light you want to create: