Chris, we're talking about monitor calibration, and while ambient light can have an impact on how the screen content looks the monitor can nevertheless be calibrated to a standard response using a colorimeter. The ambient light impact is going to be negligible if the aim is to match two monitors under the same ambient light.
If you wanted to compare (or even match) prints with the screen image then you'd definitely need standardised room lighting because the appearance of prints totally depends on the stimulus.
BTW the ColorMunki mentioned above can adjust the monitor output to changes in ambient light if you leave it plugged it and place on your desk. I found this of limited utility since the ambient light in my office never changes much.
Cheers
Steffen.
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