LuxBlend25 is the LuxRender's interface and export script for
Blender 2.6x.
LuxRender is a physically based and unbiased rendering engine.
Based on state of the art algorithms, LuxRender simulates the flow of
light according to physical equations, thus producing realistic images
of photographic quality.

NOTE: to use it from blender you need to activate this, specifying the
full path to luxrender (/usr/bin/)
http://www.luxrender.net/wiki/LuxBlend_2.5_installation_instructions#D._Activate_LuxBlend25_within_Blender