old lamp post , new lamp

[Mooch911]

Can you ground the lamp to the inside of the metal lamp post using a screw. Only black and white from the post. No ground. New lamp has a bare wire ground. Thanks

[Dean Hoffman]

Yes, but it will be virtually worthless. Put the lamp on its own circuit and use the smallest rated gfci you can. A better solution would be to run a new set of wires with a ground. Someone will provide more/better information.

[gfretwell]

You can do it if it makes you feel better but it doesn't accomplish anything you are not getting from the mounting screws. There is certainly no guarantee of clearing a fault with that wire. Best advice, put it in a GFCI.

[Thomas]

Better yet...solar lamp. Just did it last month, Aug 2019.