Hmm I'd probably get 6 or 8ft but I guess 4ft would work. I personally think 4ft a little short for a metal pole mase arm. Are you definetely getting direct bury or are you considering anchor base or transformer base?

Or maybe a GE pole? O_O (I didn't even know they made light poles lol.)

Here's a site that sells poles right online. Not sure how good the pricing is since I don't know how much pole typically go for but shipping is free and they include the anchor bolts. If you don't mind anchor base, it could be a good way to buy them. The pics look like they're off Union Metal's site but IDK if they sell Union Metal poles.

No GE pole way too expensive. The poles on that website are hapco poles according to the drawing at the bottom of the page. And the wood pole brackets are Utility metals. I don't want an anchor base because that is just too much to me. Shoot I may just go for a new wood pole.