For physically accurate and comprehensive lighting analysis, Ecotect can output RADIANCE scene files data for direct input into the RADIANCE Lighting Simulation Software written by Greg Ward at Lawrence Berkeley Laboratories. This is a very accurate simulation tool that is available freely to the public. For MS windows machines, you will require the Desktop RADIANCE download available from http://radsite.lbl.gov/.

Ecotect includes support for the automatic generation of material data and control files (RIF files), as well as various CIE sky models. To output a set of RAD and RIF files, select the Export... item from the File menu and select RADIANCE Scene File as the type of file. You can also use the RADIANCE button in the Export Manager panel. For more details on the options available when creating these files, see the RADIANCE Export dialog.

Inside Export Manager (RADIANCE CONTROL  PANEL) you select to export illuminance points to " Surface and/Point Analisys" so after calculation,  all you have to do do is: Inside ECOTECT press F5 (plan) and select RADIANCE results in menu (right side) "Analisys Grid" and " voillį" !!!!