Which videos help me to set a range of movements for my moving head lights?

I am working with moving head lights for the first time, and I would like to show my students how to set a range of movement for the lights. For instance, I want the lights to move only 180 degrees pan and tilt when I'm programming. As it is now, the students are avoiding the moving lights because it takes so long to get them to the position they want. I'm sure I am not the first teacher facing this problem, and I'm sure there's a video that addresses the issue, I just don't know the syntax. Thanks for any help you can offer. 

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