Before working with light sources, the first step is to properly adjust the lighting intensity units so that the light source will behave as expected. AutoCAD has two light source intensity units. The first is based on the system international unit, and the other is based on the American system.

To change the lighting system intensity, click on the Application Menu button, and in the Drawing Utilities sub-menu click on Units. This will open the Drawing Units window, where you can find the lighting intensity units in the section called Lighting, as shown in the following screenshot:

Now that we have set the lighting intensity units, we are ready to begin creating light sources in our model, and we will start with the first light source type, which is the Point light source.