A SquareLight is a positional light with a square shape.

A SquareLight may use a HDR texture which will be maped on its surface.

Set a HDR texture on a SquareLight
  1. Select the SquareLight.
  2. Set the SquareLight > Light Map > Map attribute with the texture filename.

A SquareLight using a HDR texture.

Use the SquareLight > Light > Intensity/Exponent attributes to control the HDR texture intensity. The User Guide/Lighting/Positional lights section.