A hearing instrument has an integral injection-molding casing. A photosensitive ground resin film is formed on an insulating substrate by coating process. The hydrolysates of the present invention are substantive, resisting both physical and aqueous-based removal from skin and hair, exhibit a unique surfactant property, and are not foaming agents with water. The LEDs are configured to be placed in front of the user’s left and right eyes, respectively, and are programmed to pulse light at a frequency that helps induce the particular state of consciousness in the user.