After days of searching and reading tons of articles ( ), I found a really interesting one, handling the problem of human interaction with computers, pointing out the problems, how users recognize and process information, displayed in front of them…

Thanks for the pointer to further info.

Cheers, Thomas

I’m not an expert, so I can’t give you a definitive answer. But under normal daylight conditions you will be using the cones, not the rods. Human perception of colour is complex.

“Overall, human spectral sensitivity is split into two parts: a peaked short wavelength sensitivity centered on “blue violet” (445 nm), and a broad long wavelength sensitivity centered around “yellow green” (~560 nm), with a trough of minimum sensitivity in “middle blue” (475 to 485 nm).”

For more information see:
http://www.handprint.com/HP/WCL/color1.html

Not sure if I’m barking up the wrong alley: does the rods’ sensitivity to blue light affect how much brighter we perceive blue LEDs (referring to “…The rods only detect light at the blue end of the spectrum, but they are extremely sensitive and can detect a single photon of light…”)?

Thanks for the very interesting article!

Thomas