Our porch light outside the garage was hit with a basketball and broke the arm off the wall mount.

Is this something that can be fixed with epoxy or cement?

Would love some thoughts. Thanks in advance!

That's potmetal. I guess you could braze it but I've never done it. I'd just toss it and replace with something similar.

I guess you could use JB Weld but I don't think it's going to hold the weight, personally.

Since basketballs will continue in this area
and seems like an EZ pull off & rewiring job
a trip to the coach lighting center seems in order to buy a replacement ... and its twin, if any.
Lexan/unbreakable materials come to mind
as well as a design without an arm where a BB could force down another breakage ala the Flush Mounts
something more pleasing than e.g.

Does that top 'arm' have a threaded fitting with an electrical locknut? I can't tell from the picture.

If so, I would just buy a large (but thin) flat washer to put behind the broken housing and re-tighten. You'll need to disconnect the wires first, of course.

The bottom 'arm' looks to have some type of bolt, perhaps? If so, do the same thing.

Also, I agree I wouldn't rely on an adhesive in this case, even if '1 drop holds 2 tons' and even if they assemble airplanes with adhesives these days.

I do use glues/adhesives in my repairs, but I always make sure I have a mechanical backup.

If you have (2) of these and they match, you may need to find an exact replacement, which can be tough.

At least the ball didn't go through a window!

My wife laughs at me for spending a couple of hours fixing $5 and $10 questionable junk, but put me in the camp of go buy replacements.

jb weld would probably work. although it might not look very nice if you have to use a bunch of it.

Try JB weld first. Mix some up, put it between the parts, and wipe off excess on the outside.

If you want a very strong repair, you need to add tensile strength and not just effectively glue everything together. From the backside, you can strengthen the fix by drilling a 3/16" or so hole into the bottom part that's broken off. If you can make it wider, do it. Go as deep as you can without going through, maybe 3/4"-1". Make it perpendicular to the back face. Get a piece of coat hanger about 2" long, rough it up with 60 grit sandpaper, and make a sharp 90* bend in it. One end should be just shorter than your hole, and you want the other side to let flat against the inside face of the fixture. Mix up more JB well and fill the hole. Force it in with a toothpick to get any air pockets out. Before it sets, put the coat hanger in so the other half of the bend faces the top of the fixture. Put more JB weld under, around, and over it to make sure it's attached. You can do similar to the top, without drilling the hole, by JB welding another short coat hanger piece where the wiring comes out. It would be easiest to pull the wires back to where the bulb is to give you room to work and then feed them back through. Make sure you leave plenty of room to repull them and leave no sharp edges or burrs.

You'll probably be in for like $10 or less with this. If it works, you save a bunch of money. If it doesn't, who cares.

ETA If that part screws on line someone else said, JB weld or clear epoxy on the pieces of the face that broke off and then add the suggested large washers.

Replace those. No way jb weld holds that through the summer

The finish is starting to flake off of that fixture anyway; time for replacement as it will look like junk in less than a year or so.