... Even works in large frosted glass balls ...

After a long wait finally arrived from China - albeit in miserable packaging and abgesprungener lights cap on one of three lights - they work. As I had expected, hopefully, even in large frosted glass balls (Ø 40) of corridor lighting. That's the advantage of "Radar" technique (microwave) to optical systems.
Deductions's because of packaging in soft and padded Pappkartöngchen bag (!)
The advantage is that you can see through the chipped cap how simple is the design of these lamps: round board with sensor and LED SMDs, two strands to the control unit and two strands for E27 base.
The lights will be switched silently, the detection cone is pretty good for 2.40 m high hanging corridor lamps.
Since I am an optimist, I look forward to many years of favorable corridor lighting :))