Fig. 2.

SPD comparison of different light sources. Four^§ dermoscopes, an Apple iPhone 11, and two alternate reference sources (xenon-arc and daylight) showing marked variations between different types of light and variations of SPD of “white” LEDs used in different dermoscopes. Halogen emits more energy in the red and near-infrared portions of the spectrum, xenon and daylight have broad SPDs, and all LEDs show the characteristic narrow spike in the blue region, a dip in energy produced in the 400- to 500-nm range, and a gradient of lowered energy emitted in the red and near-infrared regions. ^§Plus one additional setting of “orange boost.”