An illumination device, in particular for a vehicle headlight, at least comprising - one or several light sources emitting light of a first wavelength or wavelength range, - a wavelength converting member converting at least part of the light of the first wavelength or wavelength range into light of a second wavelength or wavelength range, - a first and a second light guiding element, said first light guiding element being arranged between the one or several light sources and the second light guiding element and said second light guiding element being arranged between the first light guiding element and the wavelength converting member, and - a reflective member being attached to a side of the wavelength converting member opposite to the second light guiding element to reflect the light of the second wavelength or wavelength range back through the wavelength converting member to the second light guiding element, - wherein the second light guiding element is designed to guide the light emitted by the one or several light sources and having passed through the first light guiding element to the wavelength converting member and to guide the light of the second wavelength or wavelength range which has been reflected at the reflective member to the first light guiding element, and - wherein the first light guiding element comprises at least one first guiding structure guiding the light emitted by said one or several light sources to the second light guiding element and at least one second guiding structure (1b, 1c) guiding the light of the second wavelength or wavelength range which has being reflected at the reflective member and passed through the second light guiding element to an outcoupling surface of the first light guiding element. - one or several light sources emitting light of a first wavelength or wavelength range, - a wavelength converting member converting at least part of the light of the first wavelength or wavelength range into light of a second wavelength or wavelength range, - a first and a second light guiding element, said first light guiding element being arranged between the one or several light sources and the second light guiding element and said second light guiding element being arranged between the first light guiding element and the wavelength converting member, and - a reflective member being attached to a side of the wavelength converting member opposite to the second light guiding element to reflect the light of the second wavelength or wavelength range back through the wavelength converting member to the second light guiding element, - wherein the second light guiding element is designed to guide the light emitted by the one or several light sources and having passed through the first light guiding element to the wavelength converting member and to guide the light of the second wavelength or wavelength range which has been reflected at the reflective member to the first light guiding element, and - wherein the first light guiding element comprises at least one first guiding structure guiding the light emitted by said one or several light sources to the second light guiding element and at least one second guiding structure (1b, 1c) guiding the light of the second wavelength or wavelength range which has being reflected at the reflective member and passed through the second light guiding element to an outcoupling surface of the first light guiding element.