Next we'll look at making keyframes when in the Properties window, ones for light color specifically:
Move the Current Frame Indicator to frame 1.
Click on theRMB to select the lamp in the 3D View. Select the Object Data button in the header of the Properties window. It's the seventh button from the left with the lamp, as shown in the following screenshot:
Down in the Lamp subpanel, there is the white box that you used to change the lamp color earlier. Move the cursor over that box and Press I to insert a keyframe. There is no menu, but the white box gets a border. In the Graph Editor you now see a control curve for the lamp.
In the Graph Editor, move the Current Frame Indicator to frame 20.
In the Lamp subpanel of the Properties window, make the light a different color. The white box changes color. With the cursor over the box, press the I key to insert another keyframe. You will see the new keyframe appear in the Graph Editor as well.
If your 3D View window...