In this scene you can see all light types: Directional, rectangular, spot and point light. All light types (SLLightDirect, SLLightRect, SLLightSpot) are derived from SLLight and can have a SLShadowMap. Only directional light (SLLightDirect) can create cascaded shadow maps. Double-click a light to see its shadow volume. With RMB > Show Properties you can see more properties under Node Properties > Shadow mapping.

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General help:

Click and drag the left mouse button to rotate the scene.
Click and drag the middle mouse button to move sidewards/up-down.
Roll the mouse-wheel to move forward/backward.
Double click with the left mouse button to select an object.
Click the right mouse button to open the context menu.
Open and dock additional windows from the menu Infos.
See more example scenes over the menu File > Load Test Scene