Fig. 2.

Average illuminance (lx) for each test subject under each bin for both devices. Each experiment took place in a controlled environment (either in a dark lab, office, or outside space) with increasing illuminance beginning in the dark environment. The illuminance distribution was binned into ten illuminance levels (x axis). Each bin consists of three points representing the average illuminance for each of the three subjects in that particular illuminance range. Each point was displayed along all individual illuminance measurement data points