Issue with the brightness slider (numeric value possible?)

As a retoucher I am supposed to keep accurate color management. I create my ICC Monitor profiles with an X-Rites i1XT meter. The screen calibration includes a brightness adjustment to meet a desired luminosity value (I choose to work on a 120cd/m level). My issue is that apples "brightness slider" wont define a value or percentage which I could associate with my current ICC profile. If I would for instance watch a movie in full brightness I could never get back to my previous brightness settings in order to maintain my desired color accuracy!
is there a way to read out or dial in a "brightness value" (maybe trough a script?)
does anyone know about an external tool that could help me (without interfering the ICCs)
THX a lot,
TIM

1. This is a user to user forum. To send Apple your requests, use the Apple - Mac OS X - Feedback link.
2. The brightness slider sets an electrical level for screen brightness, but the actual brightness depends on the age of the screen & other components, previous brightness level, manufacturing variations, etc. For this reason, even if you set the level to the same indicated value each time, this does not guarantee the actual brightness will remain the same, nor can you calibrate indicated values directly in cd/sqm over long periods of time. You will still periodically have to use the calibrator.
3. You can use an Applescript to set the electrical level to a repeatable numeric value (although because of #2 above, this will not guarantee a repeatable actual screen brightness). See Any ideas on adjusting monitor brightness via AppleScript? for a suggested script. Note that you will need to change "Color LCD" in that script to whatever name your System Preferences > Displays > Display tab shows & change "0.8" to whatever brightness level you want (with 0 being darkest & 1 being brightest). You must also have GUI scripting enabled.
A more elaborate version of the script could save the current value for later recall or set different levels for different apps. For help with this, post in the AppleScript forum.

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