With NUBIGON, you can add lights and shadows to your scenes.
Launch the Lighting window
from the sidebar and press Activate Lighting.
If you have disabled the computation of normals when opening point clouds, lighting will not work. Lighting is not compatible with the x-ray display mode. 
Light Sources
NUBIGON features three types of light sources. Every light source in the scene is treated as a distinct object. You can toggle their visibility from the Object List. You can also use manipulators to move and rotate them around.
Point Light 
Click the point light icon to create a new point light. The point light will appear in the viewport one unit in front of the camera.
Spot Light
Click the spotlight icon to create a new spotlight. The spotlight will appear in the viewport one unit in front of the camera and point along the negative z-axis.
Directional Light 
Click the directional light icon to create a new directional light. The directional light will appear in the viewport one unit in front of the camera and point along the negative z-axis.
Default Flashlight
Enable the Default Flashlight option to illuminate the viewing direction of the camera. Once enabled, you can also configure its parameters.
- Range defines the distance from the viewpoint that the flashlight illuminates.
- Color enables you to set the color of the flashlight.
- Intensity sets the strength of the flashlight.
- Spot angle determines the area directly illuminated by the light source.
- Penumbra angle defines the partially illuminated outer area.
Basic Options
Ambient color is a small constant (light) color multiplied to the final resulting pixel color, thus making it look like there is always some scattered light even if there isn’t any light source in the scene.
Apply Gamma correction to the final output color before displaying it to the monitor.
Press (Re-)compute shadows to update shadows cast from all visible light sources in the scene.