Hi. I have been spending quite some time today trying to calibrate my monitor correctly, mainly for photography work. I am now satisfied that my colour and contrast are correct. However, when setting my brightness level, I decided to go with what seemed like a general photography standard of 120cd/m2 but when I did the calibration using my Spyder 4 colorimeter it told me that with 120 set on the monitor it was actually measuring over 130. To get the readout from the colorimeter to be 120 I had to lower it on the monitor to 106. I know monitors are supposed to lose brightness over time but this one seems to be gaining brightness. Has anyone had this before? Colorimeter measurement issue perhaps? The monitor is an eizo coloredge cs230 and quote old now. I have had it for several years. Is there another method I can use to verify what the brightness actually is? I do have an old spyder colorimeter I could install that may be able to provide a ‘second opinion’.