To create a light
By default, the light is added to the center of a scene.
To set light options before adding the light to the scene, select Create > Lights > .
(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. )
Each type of light is represented by a different icon in the viewport. A light’s default options determine how the light affects the scene and whether or not it casts shadows, but you can (and typically will) change most of these options on a per-light basis by adjusting the light’s attributes (see Adjust light source attributes).
Like any other object in your scene, you can select a light and move, scale, or rotate it interactively with a manipulator or with numerical precision by changing the values in the Channel Box or Attribute Editor. To direct the light emitted from a light source and otherwise position features of lights (such as a camera’s pivot point), see Show, hide, or resize a light manipulator.
For a description of the light options, refer to the following:
Copy the lights instead of instancing. For light fog, make sure that light fog is duplicated independently of the light because when you duplicate a light, its light fog is not duplicated with it.