ocular rewritten

I am having trouble making a scratch code for a flashlight. The way it works is that once I shine it on a specific part of a sprite, it brightens up. Can someone make a line of code that will help?

something like this?
https://scratch.mit.edu/projects/992970492/
i know it's not the best but i tried my best

I have a big sprite though but kind of accurate

But also for the background

Here is a very complicated one if you are interested: Multiple light sources that is scalable to different intensity and size: https://scratch.mit.edu/projects/965185923/

when green flag clicked
repeat until <scratcher>
repeat until <>
repeat until <>
repeat until <>
repeat until <>
repeat until <>

end
end
end
end
end
end