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Flicker is a kind of annoyance of the human eyes. This is due to the fact that the human eyes are sensitive to the light color and light intensity, which vary under flicker conditions. The light color depends on the light spectrum. How the light spectrum varies under flicker is the interesting problem. In this paper, the lamp light spectrum of the incandescent lamp and the fluorescent lamp is presented. Based on the lamp light spectrum under flicker, a frequency domain flicker measurement proposal is described in this paper.