Originally Posted by
ekki
You should listen to people from Adobe forum. Different values are recommended for screen brightness, you can often find something like 80-120 cd/m2 and neither of those is better then the other, you have to pick one that suits your environment. If you work in a very dark room then 80 cd/m2 would be fine. If there is more light in your room then 120 cd/m2 is also fine. If you work in a very bright environment and you don't have influence over it then 160cd/m2 will be the right choice as well.
As for 5500K / 6500K: The standard light for assessing prints is 5000-5500K, so it was considered a standard to calibrate monitors like that. But you had more room for colour temperature adjustments with CRT screens. Now with LCD screens it is a different story, because they have a nominal value, and changing it is not so easy, it makes your gamut smaller. And most LCD screens are made with white balance closer to 6500K. So it is better to set your screen to 6500K.
Also, that would be an issue if you had your screen just next to viewing booth and if you could see both at the same time. A print under 5500K light and screen calibrated for 6500K. The print would be more yellow. But if you had the viewing booth in another room you would probably not notice the difference, because our eyes are very good at adopting to different light.