Uplifting News
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Not really. Yes, binary is on or off, but how the signal is read is it has a threshold for on/off. This is true for light, wither fiber optics, and also electricity. The universe doesn't work on binary. We say "if the signal value is > X, do Y". Electrical engineering actually has to handle variability in the signal, while computer science just pretends it's actually binary.
I'm not just making up hypotheticals. If your idea were better it would be used. Fiber optics to transfer light is actually a thing that's done. Here is a company selling that product, and there are many others, but I've also seen things about large structures using a custom solution too. It literally does work and is actually done in reality.
I see your dornob and raise you one solatube
And yes, I know digital "on"/"off" isn't literally either 5V or 0V, it's really "high"/"low", but practically speaking that doesn't change anything about what I said and it's more cumbersome to use those terms in casual conversation because it assumes a knowledgeable audience. Either way, when the memory latches in the register, each bit is either on or it's off, and fiberoptics work the same as electrical in that sense. That level of complexity and precision is not needed for distributing daylight.