Reference viewing environment for Adobe RGB and sRGB v2 'black scaled' profile

[denny168]

Is it strange that the recommended ambient illuminance for Adobe RGB is much lower than sRGB, while the white point luminance for Adobe RGB is much higher than sRGB? Let's assume we can get a right print from the sRGB reference viewing environment, the print form the Adobe RGB reference viewing environment would be much darker, right? Why would the adobe RGB standard has a bigger gamut but a lower contrast? So the print from Adobe RGB profile would have less contrast than sRGB profile?

sRGB (http://www.color.org/chardata/rgb/srgb.xalter)
White point luminance: 80 cd/m2
Black point luminance: 0.2 cd/m2
Contrast: 400:1
Ambient illuminance: 64 lux

adobe RGB (http://www.color.org/chardata/rgb/adobergb.xalter)
White point luminance: 160 cd/m2
Black point luminance: 0.5557 cd/m2
Contrast: 288:1
Ambient illuminance: 32 lux

Is there any benefit to use this updated sRGB v2 'black scaled' profile as color space over the old one?
http://www.color.org/srgbprofiles.xalter#v2

Thanks
Denny

[digitaldog]

You're getting these values from where?
All the RGB working spaces are synthetically created based on theoretical displays in a theoretical condition for ambient light. Adobe RGB is a 'kludge' fix for a working space proposed called SMPTE240M that Adobe didn't get the correct on-line spec's for (I believe only chromaticity values but perhaps ambient). When the SMPTE found out, they informed Adobe who had already released it in Photoshop 5 so in 5.5, they changed the name to Adobe RGB (1998). 
These aim points for ambient light have nothing to do with how you use these working spaces and the conditions of your calibrated display system. Not if your goal is a screen to print match.

[denny168]

Andrew,

Thanks a lot for your reply. The numbers are obtained from the ICC website, I had included the links in my post.

What about the updated sRGB v2 'black scaled' color space profile, would you recommend to use this over the old one?
http://www.color.org/srgbprofiles.xalter#v2

[digitaldog]

What about the updated sRGB v2 'black scaled' color space profile, would you recommend to use this over the old one?
http://www.color.org/srgbprofiles.xalter#v2

If I were using a 3rd party sRGB profile, I'd use the one that provides all tables so a perceptual rendering is an option. Should be one to download on that ICC site.