If you select the light and then press 'x' twice you will bring up the advance move tool for rotation. Most if not all of the lights allow you to rotate them on all 3 axes
Thanks, I've been playing infrequently so I forget how do stuff.
I know we can change the color of some lights but how about the intensity/brightness and radius?
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Only with the floodlights.
You mean all the lights of which you can change the colour! Those are a lot more than only the floodlight.