The frequency of the flicker of this particular candle flame is ~9.9 Hz. From TFA: > the dimensions of the fuel source are defined by the size (diameter) of th

The frequency of the flicker of this particular candle flame is ~9.9 Hz. From TFA: > the dimensions of the fuel source are defined by the size (diameter) of the candles and possibly their proximity Candles vary in size, so other candles may have different frequencies.