I've been able to animate the position of a spotlight in scene. But I want to be able to make the light fade out at a specific time.

I've tried setting keys and changing the settings but all I end up doing is turning off the light for the entire animation.

How can I make the light fade out? Is there a way to make the light change colors at a specified time as well?

I also want one light to fade out and another fade up. How can I properly amimate these parameters?

Thanks.