Fig 1.
Overview of measured description in this study under different conditions with their illuminance levels recorded.
Sensor source positions: TS—Towards the source, IS—Intermediate from the source, OS—Opposite to the source, US—under the source and AS—away from the source.
Table 1.
List of nine outdoor and four indoor locations with their description.
Pictorial presentation of these locations are available in S1 File.
Fig 2.
Illuminance levels recorded under direct source, hat and with a cap on two sunny days.
TS, IS and OS sensor source positions recorded in four different time points of a day (07:00–08:00, 10:00–11:00, 13:00–14:00 and 16:00–17:00 hours). The dark shaded area on the top of each bar represents the difference in illuminance levels obtained on two different sunny days. The downward-facing arrows in red colour represent illuminance levels <1000 lux.
Fig 3.
Illuminance levels recorded under direct source, hat and with a cap on two cloudy days.
TS, IS and OS sensor source positions recorded in four different time points of a day (07:00–08:00, 10:00–11:00, 13:00–14:00 and 16:00–17:00 hours). The dark shaded area on the top of each bar represents the difference in illuminance levels obtained on two different sunny days. The downward-facing arrows in red colour represent illuminance levels <1000 lux.
Table 2.
Overall and direct median (IQR) illuminance levels with range recorded in different outdoor and indoor locations (irrespective of the time of the day, sunny or cloudy weather, relative sensor source positions, use of sun protection, and summer and winter season).
Fig 4.
Illuminance levels recorded in four indoor locations on two sunny and cloudy days.
US and AS sensor source positions recorded in four different time points in a day (07:00–08:00, 10:00–11:00, 13:00–14:00 and 16:00–17:00 hours) in a sunny (left panel) and a cloudy day (right panel). The dark shaded area on the top of each bar represents the difference in illuminance level in two sunny and two cloudy days. The upward-facing arrows in red colour represent the illuminance level > 1000 lux.
Fig 5.
Illuminance levels recorded in three outdoor locations during summer and a winter season.
TS, IS, and OS sensor source positions recorded in four different time points of a day (07:00–08:00, 10:00–11:00, 13:00–14:00 and 16:00–17:00 hours). The dark shaded area on the top of each bar represents the difference in illuminance levels obtained on two different days.