750 nits (cd/m^2) does fall within the high brightness range but the sensor for the Spyder is tunes for optimal performance in standard lighting conditions. The SpyderPro is tuned for calibration in a broader range of brightness levels, specifically beyond 400 nits (cd/m^2) (but performs equally as well as the Spyder in lower ranges using one of the 6 other Display Technologies).

This support article is referring to the following Datacolor Spyder products:
Spyder and SpyderPro.

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