Try it yourself, you may learn something. Slobodan's avatar subtitle says it all: "When everybody thinks the same...nobody thinks."
Here's what I wrote (not the first time, not the last):
You can't have too little ambient light! The less, the better as any light striking the display affects your perception of black. And black is damn important! http://digitaldog.net/files/BlackisBack.pdfFrans took issue with that text. And that's fine.
Where did I come up with this idea? Did I wake up one morning like Frans and found this idea in my head? No! It's from working with people who know far more about this subject than I and are happy to teach. The concept was from Karl Lang who designed the Radius PressView and the Sony Artisan. Karl is a real life color scientist.
http://www.lumita.com/information/I've worked with Karl over 20 years. He was the tech editor on my book.
Karl's concept also makes sense to anyone who's willing to use some critical thinking about the subject: any ambient light that strikes the display will affect our perception of black. Karl designed the image Douglas Dubler created in the above PDF. That simulation shows the effect of black (by altering the contrast ratio of the calibration) but none the less, the effect of black is rather important.
Does the data points from another actual color scientist, Karl Koch appear to be a figment of my imagination? No. His text, the recommendations of the ISO are not ambiguous.
Has Frans provided a lick of evidence that he's not making this stuff up?
No. Is the ISO wrong?
No. Can he tell us what lux level below 32, recommended by the ISO will automatically produce a situation where we'll edit our images so they OR our prints are too dark?
No. Is anyone here taking Frans seriously? Seems not. That's good.
What Frans should do, but can't, is provide similar evidence and data. Not ideas he's dreamed up on his own. Better yet, he should find a forum on either Fox news or Breitbart where like minding people can debate political science without requiring facts or science. That's constructive feedback considering Frans cannot back up his flat earth ideas he dreams up.