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

Kevin Krisciunas, Don Carona
Using CCD observations of a candle flame situated at a distance of 338 m and calibrated 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 with the spectral energy distribution of Vega. The human eye cannot detect a candle flame at 10 miles or further, as some statements on the web suggest…
Read more at http://arxiv.org/ftp/arxiv/papers/1507/1507.06270.pdf

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