Brightness change after 10.5.8 update

Is it my imagination or did 10.5.8 change the display brightness? On my early 2006 20" core duo iMac I had to crank the screen brightness down to almost the bottom setting to get what I think I had before. Wonder if anyone else feels there was a change.

My Imac 'august 2007', also changed to full brightness.
However I am not able to lower the brightness.... well I can but after a reboot all is back to full brightness.
This is already causing me headaches as I am a professional photographer and was happy with the fact that all was calibrated well (I do this every 4 weeks).
However If I can't restore the brightness back to its lowest position, my calibration is way off!!! and recalibrating doesn't make sense this way!

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