Looks like neon bulbs behind each segment.

-Dan

On Thu, 5 Jun 2025, Mac Doktor wrote:

What is the light source?:
https://www.ebay.com/itm/373400413770

https://www.ebay.com/itm/297372018241


Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

“...the book said something astonishing, a very big thought. The stars, it said, 
were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The
Backbone Of Night", Cosmos, 1980


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