The combination of 2 types of Osram leds will bring you an optimal and flexible light quality in accordance with the latest light recommendations:POSITION1: enriched white light on the most effective blue wavelengths in the “max” position for your light therapy session; the white light becomes warmer (orange-yellow color) when you reduce the intensity for comfort use as a desk lamp or auxiliary lamp throughout the day after your light therapy session (30 to 60 min per day).POSITION2: specific soft blue light and just as intense as intense white light. Indeed, our melanopsin ganglion cells, whose role is essential in the regulation of our biological clock, are very sensitive to blue wavelengths (460 to 485 nm). So blue monochromatic light can be as effective as much more intense white light).