 Camera:
You should think about the Vray camera as you would think at a camera with manual settings. For a dark environment you should set the camera with longer exposure time (that means small numbers at shutter speed) and smaller number at the diaphragm opening that means small numbers at the F-number and occasionally if the scene is really dark you should increase the ISO number (that would mean the granulation of the film or what you may call sensitivity of the film to the light - the CMOS sensor on the DSLR).
In a brighter environment it is exactly the opposite, less exposure time and higher f-numbers and also for better results you should use a ISO number of about 100 would give less noise on the picture (the ISO is used with higher rates where the scene is very dark so that the sensor would be more sensitive to the light and the indirect light from the objects)
Rendering:
As I said before nothing special with the Render settings... just higher values on the subdivision and exponential color mapping with higher values (2.5) to have the darker areas lighten more.
For enclosing I have added another render with the same camera and settings, just another angle:
Related Links:
Authors Blog: www.kontur.ro
Understanding IES Lights: Tutorial Here
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