Vodafone, Krebsgasse 5-11, Köln

No, those aren't candles !! Here are the closeups:

Here's a pic from Wolfgang Duven:

http://www.duven.de/bilder/dxbg69_1.jpg

I wonder if that microcell also increases coverage inside those buildings close by. Since microcells don't really have that far of a reach I would think that it may just be for the outdoor capacity.

That must be it since the next rooftop is located a couple blocks away with a few buildings in between.