The core difference lies in the approach to fluorescence and repeatability. M0 simply and uncontrollably exposes the sample to all UV from its light source, recording the intense response of fluorescent materials. This response is variable and unreliable due to differences in devices' light sources. In contrast, M1 Measurement uses advanced technology (such as engineered-spectrum LEDs) to simulate the effect of fluorescence in a standardized and repeatable manner.

In practical output terms, M0 renders colors (especially whites) with an exaggerated, cool, bluish cast, while M1 provides a more realistic and warmer representation that aligns with human visual perception under standard lighting. Therefore, M1 establishes a reliable foundation for calibration, ICC profile creation, and ensuring color consistency across the supply chain, whereas M0 is only notable as a historical reference for understanding the concept.