Can anyone please explain or otherwise comment on the following discrepancy in reported monitor brightness levels between NEC SpectraView Profiler 4 and MultiProfiler?
The monitor is an NEC Spectraview Reference 271 (UK version) with SpectraView Profiler 4.1.24, profiled with an i1Pro (Rev. D) spectrophotometer, all running on Win 7 Pro 64-bit.
Target settings are White Point 5800, Black Point Min. Neutral, Luminance 120 cd/m2, Gamma 2.2
Running a profile with SVP produces the expected result, with achieved values very close to the target values and confirmed by a profile validation which shows similar values with good Delta-E results.
However, with a white background the screen feels perhaps uncomfortably bright, if not slightly dazzling at times, and MultiProfiler reports a Brightness level of 182 cd/m2 compared to the SVP value of 120 cd/m2. If I lower the Brightness setting in MP to 120 cd/m2 and re-run the SVP validation, SVP then reports the actual luminance value achieved as 78 cd/m2.
Quite apart from the need to achieve the correct brightness for accurate print matching, I am concerned about the large discrepancy in reported values between the two softwares and, particularly, the likelihood of premature backlight ageing if the monitor is indeed running at >180 cd/m2. Both programs are showing the correct profile loaded and I have made no changes directly in the MP settings.
If anyone can shed any further light on this (sorry, pun entirely unintentional!) I shall be very grateful.