Redundant(?) Holophane bulkhead. I take?

I've had my eye on this bulkhead at work a while now thinking it'd be an old 80w mercury type that would be redundant & would have been disconnected years ago (it's never been lit in 5+ years). I got an opportunity to check it out the other day, I managed to loosen all the screws off and open it up to check it out, I was surprised to find it's a GLS lantern and newer than I was expecting having CE markings etc, and furthermore, it's still live!

I thinks it'll be staying where it is seeing as the cable disappears off up high & to somewhere unknown. Might bang a lamp in it though sometime, it will be useful for life testing B22 lamps.