Okay this question may do it as least I cannot find the answer in the help or the books.

Lets say you have an animation in Carrara and you want the lights to dim..would you just key frame them like say its 100 at one second and then go to 2 seconds in and set the light to 80 etc...I tried this and they dont do it gradually like an animation they do it abruptly....like a light switch being turned off.........

Please advise and than you.