Create panel > Lights > Photometric Lights > Free Area button
Create menu > Photometric Lights > Free Area Light
A Free Area light emits light from a rectangular area, like a skylight. You can set the light distribution; this light has two types of distribution, with corresponding icons. A free area light has no target object. You use transforms to aim the light.
Diffuse Distribution (Photometric Lights)
Web Distribution (Photometric Lights)
Name and Color Rollout (Lights)
To create a Free Area light:
Choose Photometric from the drop-down list. (Standard is the default.)
Click the viewport location where you want the light to be.
The light is now part of the scene. It points away from you in the viewport you clicked.
You can position the light and adjust its direction with the transform tools. You can also adjust the light's position with the Place Highlight command.
To adjust the light:
On the Main toolbar, click Rotate. Drag the selection to adjust the light.
Tip: You can also adjust the light's position with the Place Highlight command.