Which CFF law states that a stimulus flickering at a frequency greater than CFF will have the same brightness as a non-flickering light with the same luminance?

The Talbot-Plateau Law describes the phenomenon where a flickering light stimulus, when presented at a frequency above the critical flicker fusion (CFF) threshold, will appear to the observer as having the same brightness as a steady (non-flickering) light of comparable luminance. This law illustrates how our visual system processes rapidly changing stimuli.

When a flicker exceeds the CFF, the visual system can no longer distinguish individual flickers and integrates them, resulting in a perception of a continuous light. This understanding is crucial in fields like vision science and optical engineering, as it explains how brightness perception can remain constant despite changes in the flicker rate, provided that it surpasses the CFF threshold.

The other laws mentioned, while important in different contexts of visual perception, do not specifically address the relationship between flickering light and the perception of brightness in relation to the CFF. Therefore, Talbot-Plateau is the appropriate answer as it directly relates to the phenomenon described in the question.