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Using CCD observations of a candle flame situated at a distance of 338 m andcalibrated with observations of Vega, we show that a candle flame situated at~2.6 km (1.6 miles) is comparable in brightness to a 6th magnitude star withthe spectral energy distribution of Vega. The human eye cannot detect a candleflame at 10 miles or further, as some statements on the web suggest.

At What Distance Can the Human Eye Detect a Candle Flame?