Hello Elango,
l know 2 ways how to check your render licence. Please se pictures below.
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There are many differencies between ARX and Photorender.
From main point of view the main difference are HDRI scenes. ARX use HDRI scenes (HDRI scenes are a standalone topic).
These "picture" is a source of light. See youtube link:
Vray HDRI tutorial in 3ds Max - YouTube
Sky and sun in background are HDRI scene "picture".
As you can see in time 5:15 the HDRI becomes a part of final render picture ---> is reflected in swimming pool and makes a building lighter from right side.
Vladimir Palfy (my rendering guru) create great topic how to make your own HDRI scene.
Tutorial: HDR library for Rendering of your CAD design - GrabCAD
In general ARX is much more realistic than Photorender.
Hope it can helps you
