You can now buy me cake and things to take apart at:-
If you’ve bought or are considering buying an LED floodlight from ebay, then this video will show you some of the pitfalls. From unconnected ground wires to MUCH less than half the quoted power rating.
I’m not sure why it’s so common to see the earth wires left unconnected. The fixture is mains voltage and metal, so it should be earthed, especially when the cable has an earth conductor in it. Although the LED operates at a reduced voltage, there is still the potential for water ingress, electronic failure or bad manufacturing that could result in the casing becoming live at mains voltage posing a shock hazard with the light and associated metalwork in the vicinity.
It’s a shame really, because otherwise these fixtures are very neat and functional. The quality of the housing is quite good and the way the LED is mounted directly on the finned case means that it’s temperature is maintained at sensible levels.