Mercury vapour Floods and Spots

Spotted loads of these in use at Salzburg Zoo near Hellbrunn palace.

The big floods light the animal enclosures and the smaller spots are used for the smaller enclosures and also the public walkway areas together with low level PL-L bulkheads.

I was wondering if they might have been SON at first but as I was there at dusk, I witnessed them being group switched and are clealy all running MBF lamps.
Nice to see big mercury vapour installation still going and being maintained.