An example device is configured to emit a first light having a first luminous flux and a peak intensity at a first wavelength that is greater than or equal to 400 nanometers (nm) and less than or equal to 480 urn. The first luminous flux is variable and/or the emission of the first light is interrupted one or more times. The device is also configured to emit a second, light having a second luminous flux and. a peak intensity at a second wavelength, that is greater than or equal to 500 ran and less than of equal to 630 nm. The second Luminous flux is variable and/or the emission of the second light is interrupted one or more times. The first luminous flux is at a maximum at least during a time at which the second luminous flux is not at a maximum.
