Written by Olivier Saraja (olivier_at_linuxgraphic.org)
English version
As you should already know, there are two convenient ways in order to set a light system:
Using the menu: Insert > LightUsing the toolbar: click on the icon
Once this basic operation is done, the Object tree should show a new entry called 'Light'. By selecting it, the Object Properties View should update and show the available parameters for a standard light system: