Move: Use Move to change the position of lights. You can also use it to change the position of light targets.
Once you have placed lights in your scene, you can use transforms to change a light's position or orientation.
Use transforms on light objects as follows:
Move: Use Move to change the position of lights. You can also use it to change the position of light targets.
Rotate: Use Rotate to change the orientation of lights.
You can't rotate a target light about its local X or Y axes. Instead, use Move to move the light or its target. Rotating the light about its local Z axis can be useful if the light uses a rectangular beam or projects a bitmap.
Rotating a plain omni light has no effect as omni lights cast light uniformly in all directions. However, rotating an omni projector light causes the projected image to rotate.
Scale: Scaling spotlights and directional lights changes the size of their light beam and attenuation ranges. Scaling omni lights changes only the attenuation ranges.
Light viewports are another convenient way to transform and change parameters of spotlights and directional lights.
Tip:
When you adjust lights, it can be useful to turn on Degradation Override. If Override is off and shaded viewports begin to display in wireframe, you can't see the result of the changes you make to lights.
You use Place Highlight to position a light to create a specular highlight at a designated point on an object. Place Highlight is one of the buttons on the Align flyout.
Place Highlight moves or rotates the selected light object to aim it at a face on an object you pick. The light maintains its original distance from the face.
Place Highlight works with any kind of selected object. You can also use Place Highlight with a selection set that contains more than one object. All objects maintain their initial distance from the face.