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. Author manuscript; available in PMC: 2014 Aug 19.
Published in final edited form as: Curr Biol. 2013 Aug 1;23(16):1554–1558. doi: 10.1016/j.cub.2013.06.039

Figure 2. Light exposure.

Figure 2

Average light exposure (lux) plotted on a log scale during the week of exposure to electrical lighting in the constructed environment and exposure to the natural light-dark cycle while camping. Data are double plotted so that light levels across midnight (24h local clock time) can be more easily observed. For reference, one lux is equivalent to the light exposure received by the eye when gazing at a candle 1m away, moonlight is ~0.1 lux, typical indoor lighting is ~200 lux, sunrise or sunset is ~10,000 lux and looking at a bright blue midday sky is >100,000 lux.