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What is a flash of light?

When the frequency of regular, continuous flashes increases, flickering light occurs.

As the frequency increases further, the flickering sensation disappears, and the light appears continuous again.

This frequency is called the critical fusion frequency (CFF). Flashes with a frequency above this frequency are considered stable light sources. The Talbot-Plateau law states that the brightness or intensity of a stable light source formed by the fusion of high-frequency flashes is equal to the average brightness or intensity of the flashes, and remains constant regardless of the on-off time ratio of the flashes.