Following my question in p.a-u, I searched the web for some free 
software. I came across this site: 
http://www.techsupportalert.com/best-free-high-dynamic-range-hdr-software.htm 
and used the first one proposed (Fusion 1) to try out on a POV scene.

As render set, I used 4 renders of my Urbex scene with varying light 
intensities and processed them through Fusion 1, using the Summator as 
advised on the site. This is the/a result.

I think this looks quite promising while needing further experimentations.

Thomas

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