Is it possible to change a SpotLight's cone angle using a timeline?

I have this blueprint:

Click image for larger version

Name:	Screenshot_1.png
Views:	1
Size:	166.6 KB
ID:	1176676

The upper timeline changes the intensity just as I wanted to.
The lower timeline does completely nothing

This is the lower timeline (Changes the angle):

Click image for larger version

Name:	Screenshot_2.png
Views:	1
Size:	43.0 KB
ID:	1176675
Attached Files