Understanding the GU light sensor

I just sat down with the intent of adding an auto brightness feature to my Galactic Unicorn. Dim it in low background light conditions, and go bright when the room is brightly lit. I was surprised to not find any light sensor example on Pimoroni’s Github page?
Luckily a search brought me back here, and to some nice working code I can start with. Many thanks for posting it. =)

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