Changing emission light overtime Blender 2.8 Alrighty, so I have my short little animation finished except for one thing. I can't figure out how to lower the emission light over time in separate frames.
Hover your mouse over the emission strength and hit I. The property will turn yellow, meaning that you created a keyframe. Then go to a different frame, change the strength and it will turn green (meaning no keyframe) then hit I again hovering over that strength bar. It will turn yellow and you've got yourself a basic strength changing emission shader.

Note that this works for most properties in blender. That is how you can make transformations over time.