An apparatus (27) for bio-stimulating phototherapy is provided herewith. The apparatus comprises a light source (29) for providing light with a phototherapeutic wavelength and a controller (37). The controller is configured to control operation of the apparatus, in particular the light source. The apparatus is configured for illuminating the skin (3) of a subject's body portion (1) with light emitted by the light source. The controller is configured to control the wavelength of at least a portion of the light as a function of at least one of melanin index (M) or the lightness (L*) of the skin. A method is also provided.
