A light therapy device for applying an image produced from a therapeutically effective aqueous liquid, is provided. The device includes a slide, prepared by Kirlian and/or corona discharge photography, of a sample of an aqueous liquid removed from a liquid-retaining body and mixed with ethanol, and a projection device with a light device which emits visible light and is designed to project the slide onto an object, in particular a living being, in such a way that a sample of the liquid contained in a container which is permeable to and can be irradiated by the visible light is arranged in a light path between a unit, which holds the slide, of the projection device and the object.