Todays candles have been optimized not to flicker. But it turns out when we bundle three of them together, the resulting triplet will start to naturally oscillate. Amazingly, the frequency is rather stable at ~9.9 Hz as it mainly depends on gravity and diameter of the flame. We detect the oscillation with a suspended wire and divide it down to 1 Hz.
Can we reverse engineer the flickering pattern of a real candle to improve artificial candle LEDs? Measuring and analyzing the temporal light output of a real candle.