You animate lights by using transforms or changing creation parameters on different keyframes while the Animate button is on. During animation, light transforms and parameter values are interpolated between keyframes.
Note: If you adjust a Light viewport while the Animate button is on, you animate the light.
You can use the following methods to move and rotate light objects.
Move an omni light when itÆs a "practical" light within a scene (a light that appears in the scene itself). Combine the light with a self-illuminating geometric object.
Use a free spotlight when the spotlight is to move within the scene. Free spotlights are especially intended to be animated along a path, using a Path constraint. Unlike target spotlights, free spotlights can bank as they travel. Use target spotlights when the light position is fixed.
If you do need to move a target spotlight, link both the light and its target to a dummy object, then assign the path constraint to the dummy object.
Use a Look-At Constraint to have a spotlight track a moving object.
If the spotlight is a target spotlight, its previous target is ignored.
If the spotlight is a free spotlight, it effectively becomes a target spotlight, with the looked-at object the target.
The following techniques can be used to animate light creation parameters.
To dim or brighten a light over time, animate its Value parameter.
To change the color of a light over time, animate its color parameters. Use a smooth tangent for color change keys unless you want the color to change abruptly.
To make a light flash on and off, set its Value to 0 in repeated keyframes, and assign a step tangent to its color change keys.