Click the light bulb button to activate the Shaderlight Light Placement Tool so you can place and use artificial lighting.
If it isn't already open, the Light Editor window opens when you click the Light Placement Tool button. The Light Placement Tool and the Light Editor work together in a similar way to the SketchUp Paint Bucket and Material Editor.
Lights are placed by clicking in the scene as you would place any component in SketchUp, with slight variation depending on the type of light
Related Topics
IES Web Profile Light Properties
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