Need help identifying these. 6 ft long, swivel bracket in the middle that mounts on top of the pole. The pole is 10 ft tall with square taper like an obelisk. The wingspan would be nearly 13ft. Only markings I have been able to find  is the word philips and the letters OPC. So far I haven't gotten all the giant red ants out of one of them, and the poison ivy out of the other.  Have sprayed and scrubbed exterior, but yet to see what's in store on the inside.  Spring loaded lamp holders for sure, but ballasts are still hidden.  Wouldn't imagine they are very old but....after laying on the forest floor half submerged in dirt, things tend to age quickly.

Looks like they came from a gas station

Looks like they came from a gas station

There is a few car dealerships as well as abandoned gas stations with these lights on them around here...

Those are fluorescent streetlights, and as others have mentioned probably came form an old gas station or car dealer.
The lamps would have been either VHO T12, or Powergroove T17 fluorescent.
Cool stuff!

But...

So far I haven't gotten all the giant red ants out of one of them,

EEEEKK! .. burn them!

Would either of these lamps be 5 feet long?
 I ask because the spring loaded  sockets are about that far apart,  And are there a lot of different lamps that came in this length ?

Would either of these lamps be 5 feet long?
 I ask because the spring loaded  sockets are about that far apart,  And are there a lot of different lamps that came in this length ?

a F60T12 HO -or- F60T12 VHO would both be 5-feet long, and either would have the same spring-loaded RDC lampholers (if such, exists a F60PG17 would as well...but I don't know if powergrooves were made in anything other than 4,6,8 foot).
a F90T17 is also 5-feet, but would have different lampholders.