Command entry:Click or right-click the Point-Of-View (POV) viewport label. 
POV viewport label menu Lights Lights submenu Choose a light.
A Light viewport shows the view from a spotlight or directional light, looking at its target.
Light viewport controls include the following. Two of these controls are available in all viewports.
Zoom Extents All, Zoom Extents All Selected (available in all viewports)
Maximize Viewport Toggle (available in all viewports)
For photometric lights, the Light Hotspot control actually adjusts the beam angle. At the beam angle, the light is 50 per cent of the maximum intensity.
Targeted photometric lights can be used as views only when the light's distribution is set to spotlight.
To undo changes to a Light viewport, do one of the following:
(Undo) on the Quick Access toolbar.
Dolly Light, on the Dolly Light flyout (see below) moves the light or its target or both along the light’s main axis, toward or away from what the light is pointing at. A free light moves along its depth axis in the direction its lens is pointing. On a target light, the target distance remains fixed, no matter how far you dolly.
Light Hotspot lets you adjust the angle of a light's hotspot. This button replaces the Zoom All button when a light viewport is active.
Roll Light rotates the light about its own line of sight (the light's local Z axis). Although Roll does change the light view, it affects the light object only if the light casts a rectangular beam or is a projector.
Light Falloff adjusts the angle of a light's falloff. This button replaces the Zoom Region button when a light viewport is active.
Truck Light moves a target light and its target parallel to the light view, and moves a free light along its XY axis.
Orbit rotates a light about the target. Pan rotates the target about the light.
