Hi, Parrotcrap,
I've been monkeying around with the light control features, which the manual is really very vague about in some respects.
It's kind of a dubious game of "pay attention to the illustrations" which has really had me pulling my hair out until I realized precisely what I was looking at....after which I end up kicking myself for not seeing it. Gaaahhhhh!!!!!
The parametric changes you want to see are in either the spotlight, point light, or directional light elements on the time line.
First, Create (tab found in second from left at top of main User Interface) a spotlight, point light, or directional light. (I'm going with spot light).
To see the changes available for that particular light in the timeline, go down to the timeline, and make sure the "Object Related Track" is on. (In the little symbols above the timeline, this is the second symbol from the left. If it is green, it is on.)
Then scroll down the object list until you see "spotlight". Beside the word, you will see two symbols in circles. The first symbol is an upside down carot. This is what you want to click on. It will then bring up a list of clickable elements (Transform, Color, Multiplier, Constraint, and Parameter).
As I type this, I am still monkeying around with the light settings myself, but I hope this will help you find what you seek. :)
Now, my big question is: How do I change the light cast in the color palette on the light control panel. There are only a few colors, none of which are what I need. How do I change the actual light cast color on a light tool iProp?
Respectfully,
Martok2112 :)

"Incompetence will always prevail so long as evil men stand by and do nothing."
-Martok2112