You can use several kinds of light sources in your interior design projects: sunlight, light from lamps, and firelight. You manage light sources in the current project with the Lights Properties tab of the Inspector. It lists all the light sources.

Daytime has four predefined states. To specify one, click a corresponding button in the Inspector: Morning, Day, Evening or Night. With the last button on the Lights toolbar, you can specify the time you prefer.

Electric light sources are also under your control. You can add, move and delete them from the layout. Also, you can use the Inspector to set their luminosity and color.

Directions on how to add a lamp can be found in this KB article:

How to add a lamp to your project. (KB028014)

Directions on how to change the luminosity or color of a lamp can be found in this KB article:

How to change the luminosity or color of a lamp. (KB028011)