I live in New Hampshire (The Granite State) and have a very long driveway. I am looking at putting up 18 street lamps along the driveway. Bases will be made of concrete as difficult to dig here.
I am thinking to have 1/2" rebar bent into J shape and hanging light fixture at end. Radius would be about 5'. I think the rebar will dance a little in the wind and should have a nice visual effect.
I am concerned that rebar might not be able to stand up tho as it isn't constructed of high grade steel.
thanks Bob ==================================================
Make one and try it. Exposed bare steel rusts only a few thousandths of an inch per year except where water is trapped against it (the base), then it may pit. The rust color blends well with nature here.
You might try chain link fence top rail, which has reduced ends to connect the lengths and is available in black or galvanized. it can be bent by hand and eye between two closely spaced trees. I use it for my TV antenna mast and straighten it that way after a bad storm bends it. The lamp wire would be protected inside.
I don't know where you are so I picked Nashua