Ok, I got two questions...

1. Imagine that I make a circle, and at my time slider I've 50 frames. I've made two lamberts, the first one is green the other one is blue. My question comes here... If I want to make my circle go from green to blue in 50 frames, then how do I do that?

2. If I make a Spot light, then how do I makes it go from 1.000 to 5.000 intensity in 50 frames?