Target illuminance (lux) Measured illuminance (lux) Measured irradiance (W/m2) CLA CS 8 8.15 +/- 0.12 0.0252 +/- 0.00037 5.65 +/- 0.085 0.7 22 22.0 +/- 0.23 0.0682 +/- 0.00071 15.5 +/- 0.16 2.2 60 60.0 +/- 0.48 0.190 +/- 0.0014 42.4 +/- 0.34 6.1 200 200 +/- 1.5 0.621 +/- 0040 141 +/- 1.1 19 720 720 +/- 3.6 2.23 +/- 0.010 509 +/- 2.5 42

Table 1: Target (photopic) corneal illuminance levels (lux) used in the study together with the measured corneal illuminance (lux) and irradiance (W/m2) levels. Measured levels of Circadian Light (CLA) and consequent values of Circadian Stimulus (CS) from equation 1 are also shown.