Here is a lamp from the DI
Here it is with a red oxide primer. Yes, dollar primer.
Here it is with a couple coats of dollar black spray paint. I think it looks great! Or it would with a cute lamp shade.
I also use dollar spray paint on items I am going to sand through a lot of the paint anyway. Like this table I got from the DI for $10.00
If I use higher quality paint I just have to do more sanding, and no one likes sanding.
I do splurge for the pricier paint if it is a nice piece of furniture or if the item really has to hold up to some wear and tear.