wow, tons of information.... almost any light fixture will work over an octagon box
I have some of these too. Can't listen to the radio at all when they are on. Too much interference. I took them out.So, I have several different versions of these style screw in lights Lights
They are just okay. Some of them put off serious RF noise that affects the garage door openers and other things that are in the 130-160mhz range. Not all of them do but I have had to take 2 of them down due to excessive RF noise. I didn't buy these, they were all given to me by my brother. These do put off pretty good light and are therefor better than just a single bulb.
I too am looking at other options for lights. I think I will look more at some sort direct wire LED light that will perform better.
Octagon boxes have same screw spacings as round boxesRound box.
That changes everything.Round box.
This is what I would do, and have done in all the garages I have ever owned. The receptacles make it easy to put in more/better lighting than just putting in a single ceramic fixture that uses one light bulb.4’ LED lights, either put a receptacle in the box and plug 2 into it or run conduit out of it to 2 or more 4’ LED lights.
4’ LED lights, either put a receptacle in the box and plug 2 into it or run conduit out of it to 2 or more 4’ LED lights.
What size is the box?You can't put a receptacle in a round box.
This is one option, but a GFCI will be required for any 120V receptacle in a shop/garage/outbuilding.You can't put a receptacle in a round box.
This works though:

The one shown by Shiftless is punched for 3.Those plates are illegal. They are held in by only one screw.
Are you talking about the receptacle being held in place to the plate, or the plate being mounted to the round box after the receptacle has been attached to the plate?Those plates are illegal. They are held in by only one screw.
Make sure to provide GFCI protection for your lighting circuit.
In the US chain hung fixtures are required to use stranded wire to connect them. AC cable has solid wire. Canada may be different.Or use a blank plate with a hole for a connector and run 1 or 2 whips out to fixture (surface mount or chain-hung) with AC cable.
Yes, solid wire AC90 is used in Canada for chain hung fixtures. Didn't know the USA did it differently.In the US chain hung fixtures are required to use stranded wire to connect them. AC cable has solid wire. Canada may be different.