My first suggestion was going to be to install a wall pack style light, but since you like the old fashion look, (can’t say I blame you) I second the gooseneck barn style light.
The former will put out much more light though.
Replaces 150W PSMH6300 Lumens
www.e-conolight.com
I’m going to put one of these on my parent’s garage addition. 12’ or so up.