Thanks to Heriberto for this excellent photo taken in 2012 from just outside Mrs Fenn's apartment. Snapped from a position immediately above 5a it clearly shows the two lamp standards to the east of the block. Missing of course are the poor trees which would have created an almost impenetrable barrier to light for anything on the ground floor.
The following info matters not a jot, given that the 'light reflecting on shutters' photo has been dated to years after the incident.
However, while the streetlight one can see in the photo is the one to the east of block 6, it is not the one casting the light on the shutter. The streetlight east of block is (guestimate) 40m away. The one near the block 6 car park entrance is 18m away. Anyone positing that the reflected light is coming from a streetlight 40m away has to explain why there is nothing coming from the one 18m away.
The reflected light is from the one on the corner near the block 6 car park entrance.
Back on topic. I can see nothing in the files that makes the front of block 5 a well-lit area, with the possible exception of Matthew's statement. Others go for dark. There were two streetlights nearby, both around 18m away, both with light cut down by the trees. See the 4 Mai 2007 photo for the trees.
Note. While the trees interfere with the light level, they did not suppress the view at pedestrian or car level. Essentially, you see 'under' the trees, both in and out. That is also clear in the 4 Mai 2007 photo.
So, someone driving past the front of 5A could see 5A (and vice versa).
Whilst working out what Matthew did or did not see re light levels is something I fear will not be resolved before I'm dead and long past caring.
Please forget grey in grey car. Sodium lights, well after dark, lights blocked by trees, no moon. All anyone could see was light or dark.