Range of light intensity that can be seen by humans

Range <10^-2 photons/µm^2/sec (starlight) to >10^8 photons/µm^2/sec (bright sunlight) photons/µm^2/sec
Organism Human Homo sapiens
Reference F. Rieke and D. A. Baylor, Single-photon detection by rod cells of the retina, Rev. Mod. Phys. 70, 1027 – Published 1 July 1998 DOI: link p.1027 right column top paragraph
Comments “[Humans] see over an enormous range of light intensity, from photon fluxes of less than 10^-2 photons/µm^2/sec (starlight) to greater than 10^8 photons/µm^2/sec (bright sunlight). The job of transducing light over this intensity range is divided between the two types of photoreceptor cell, which have very different sensitivities.”
Entered by Uri M
ID 111341