Compositions for the promotion of muscle protein synthesis and control of tumor-induced weight loss in patients that are, for example, suffering from cancer cachexia, and methods of administering such compositions. The composition ratio of Ga and N on the surface of the GaN-base semiconductor layer can be approximated to the stoichiometrical composition ratio. The electrical fitting permits electrical metallic tubing or EMT to be quickly attached to and removed from the electrical fitting without disassembling the fitting or cutting the tubing. Further, since the white light can be implemented with a single light emitting diode, the manufacturing costs and thickness of the backlight panel can also be reduced.