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Most people have experienced the sensation of varying light intensity from lamps as other loads connected to the same mains circuit draw fluctuating currents. This perceptible variation in light is called flicker. To measure flicker, The IEC has defined two weighting curves for flicker frequency on 230 V/50 Hz and 120 V/60 Hz systems, respectively. In this paper, we explore the relationship between these two curves and propose a light flicker weighting curve which is independent of the light bulb types as well as the supplying source system. This novel curve can be exploited to weight the light flicker spectrum for all kinds of lamps and then report the flicker severity index.