If you want the selected material to be a light source other than the sun and sky, select this option and select 'On', then set the power of the light source along with the coverage angle. 'User Defined' and 'Light/Emitter' as described below. Now you can make changes to the selected material using one or more combination of the following. The selected material name will be displayed in the 'Raylectron Material Editor' window. Next, select a material from the 'Sketchup Materials' window, or use the Sketchup 'Sample paint' picker to directly select a material from your model. First, bring up the 'Raylectron Material Editor' (if not already opened) from the Sketchup 'View / Raylectron Render' menu. It is very easy to apply some styles to your materials.