[Boot Hill]

“Just to be contrarian...If there is finite light attenuation over a finite distance, when the last photon is absorbed it's over.”

Twinkle twinkle, beam of light,
How I wonder what is right,
Are you particle or are you wave,
It's quantum knowledge that I crave!

--Boot Hill

[DB]

All I think I know is that light is quantized into integer counts. You can count individual photons (or whatever they are).