Jerry,... Thanks for your response and YES I did check ALL of the
Grounds and Neutrals within the box in the barn.
"A BAD Ground" was my first thought when I saw the bright /dim lighting
problem. All of the neutrals and grounds are in the proper positions in
the box,.. and the connector lug screws are tight on all the terminal
connections for the grounds, neutrals, and breakers.

Ralph,.. now I was kinda' hoping that someone was going to suggest the
power at the pole. The only other thing that I was thinking along that
line of thought was a problem in the underground supply leads from the
box on the meter pole to the mains in the box in the barn.

I think that with your suggestion I'll call the Power Company on Monday
and have them first check out their equipment. It's just too strange
for everything to be working fine all this time and then after that few
days of Cold, Snow, and Winter Storm for it to just go haywire on me.

Many thanks to the both of you for jumping to my aid as rapidly has you
had. It IS greatly appreciated!!