Digital BW, The Print

OK so I just took another look at my monitor calibration and realised it was
set for native white point and so I decided that since my "average" lighting
was likely a lot lower than this I decided to re-calibrate at 5000/D50.  The
Eye One recommends a target luminance of 140 for an LCD but I can't get this
even with full brightness on my Apple HD Cinema Display with a white point
of D50 (I can easily exceed this figure using native white point).  So what
should I do from here?