Vintage Instruments gives detailed description and data for conventional lighting .
Fresnel has an animation showing how the lens was created.
PAR CANS allows you to rotate the oval beam.
Ellipsoidals – Profiles in Australia shows focus and shutter operation., beam width change with lens focus.
Follow Spots show Iris, Gate, Dowser, Focus.
Strip Lights show cyclorama light coverage for distance from the cyclorama.
Cyc Lights has a diagram explaining the equal intensity from top to bottom. Use in conjunction with Strip Lights.