

Table 2: Corneal (photopic) illuminance levels (lux) employed in the two studies together with the associated levels of Circadian Light (CLA) and Circadian Stimulus (CS) from onehour exposure, the measured mean pupil diameters, the measured mean levels of nocturnal melatonin suppression, the 95% confidence intervals for the mean melatonin suppressions, and the sample sizes needed to meet a criterion probability of 0.05 for both Type I (α) and Type II (β) errors. 