500w GLS floodlight still working!

I saw this entrance to a very old looking building today which had lots of long-disused fittings. However work was being carried out there meaning that the switch had probably been flipped for the first time in at least 50 years! It was really quite incredible to see such an old fitting still working with such an old lamp, also note the Coughtrie fittings with red and green glass near the bottom of the picture, presumably part of some old alarm system, they are amazing. There were at least 8 floods here.