Yes, I can see a potential (yes, I said that deliberately and apologetically) issue if the only access to connect the lamp to the circuit is a single wire with the connection to the other side of the lamp unknown - which would be singularly weird in my experience, but perhaps the sort of thing encountered in some countries.
There are little test tools available that will distinguish "hot" from "neutral" in most circumstances if neutral is reasonably close to ground potential. e.g. Fluke 1AC-A1-II
There are little test tools available that will distinguish "hot" from "neutral" in most circumstances if neutral is reasonably close to ground potential. e.g. Fluke 1AC-A1-II