Brittle Slips!
I have just replaced about 16 Tamlite 250/400W SON floods.
They could be identified as needing replacement from the ground.
Client was not happy, however I was not willing to give the client an "acceptable" PIR with these lights in place as I considered them dangerous.
Client spark went up in the air to change the first light.
He got up there in the basket, then proceeded to undo the pivot bolts to tilt the fitting to disconnect it.
The whole front glass fell from the lamp onto his feet in the bucket.
NO injury, but it would normally have been over an area where members of the public would have been.
The fitting was mounted at the top of a lamp post, not sure of the exact height, but, I would say dual carriageway height column.
Some of the lamps had outlasted some of the fittings!