The combination of 2 types of Osram LEDs will provide you with an optimal and adjustable quality of light in accordance with the latest recommendations in terms of light: POSITION1: white light enriched with the most effective blue wavelengths in the "max" position for your light therapy session; the white light becomes warmer (yellow-orange color) when you reduce the intensity for a comfortable use as a desk lamp or an auxiliary lamp throughout the day after your light therapy session (30 to 60 minutes per day). POSITION2: Specific blue light, soft and not very intense, just as effective 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). Thus a monochromatic blue light can be as effective as a much more intense white light.POSITION 3: desk top lighting throughout the day after your light therapy session (30 to 60 min per day).