Fig. 1 | British Journal of Cancer

Fig. 1

From: Comment on ‘Domestic light at night and breast cancer risk: a prospective analysis of 105000 UK women in the Generations Study’

Fig. 1

Light levels and approximate visual ability. Luminance values are based on reflection from a nearly white surface. Both “light enough to see hand” and “light enough to see across the room” are possible starting at or near starlight levels, and thus provide equivalent information about the luminance levels in typical bedrooms. Note that exact visual performance levels depend on many factors, including previous light exposure, pupil size, and local contrast

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