Honestly I'm not sure, but based my comment off this page I read years ago: http://www.badastronomy.com/bad/misc/badstarlight.html http://www.badastronomy.com/

Honestly I'm not sure, but based my comment off this page I read years ago: http://www.badastronomy.com/bad/misc/badstarlight.html http://www.badastronomy.com/bad/misc/badstarlight.html It doesn't seem so unreasonable. I have also read the human eye can detect a single photon and 450 photons per cm³ is about 3e10 photons per second.