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Table 1 Means and standard deviations for annual integrated exposure to illuminance and irradiance in the range 450–500 nm during the six time periods of the day

From: Annual variation in daily light exposure and circadian change of melatonin and cortisol concentrations at a northern latitude with large seasonal differences in photoperiod length

   Time period of the day
(hh:mm–hh:mm)
   04:00–08:00 08:00–12:00 12:00–16:00 16:00–20:00 20:00–24:00 00:00–04:00
Light exposure Mean (lux*min) 27,654 91,945 196,408 246,982 16,621 166
N = 15 SD (lux*min) 15,922 46,024 121,967 124,183 19,830 305
Light exposure 450–500 nm Mean (μW/cm2*min) 3166 8226 15,791 20,162 1122 20
N = 14 SD (μW/cm2*min) 3925 6742 15,143 20,966 1799 41