Thanks, Don Foreman for checking out my helmet and pronouncing it good. I kept troubleshooting. It turns out that apparently, my 50W quartz - halogen welding lamp has a color temperature distribution smack in the center of the helmets sensitivity. I turned it off and substituted a cool white fluorescent desk lamp.
No problemo. Helmet works great! I can see what I'm doing, way better!
My apologies to the fine folks at Jackson for casting aspersions on their fine product.
I appreciate all the help and suggestions offered by other RCMers as well.