Fig. 2. Schematic overview of all PT-irradiance footprints with measured spectral irradiance >30 μW cm⁻² nm⁻¹.

High spectral irradiance footprints of the BlueSpot, Infantulus, Bililux, Lullaby, NeoBlue Compact, and Bilibluelight are indicated by dark blue, purple, blue, green, yellow, and red, respectively. The light gray, gray, light blue, and blue silhouettes represent the body surface area of an infant born an average body length of 22, 26, 32, and 40 weeks of gestation, respectively.^30–32 Silhouettes were adapted and used with permission.¹⁴