A high intensity discharge lamp electronics controller including a reverse protection circuit and a control protection module. The invention also provides pharmaceutically acceptable compositions comprising said compounds and methods of using the compositions in the treatment of various disease, conditions, or disorders. Insulation may be installed for reducing heat loss during operation of the retrofit cells. In another embodiment, a combination diffuser and restrictor covers the opening of each distal end. The modular segments form an implanted unitary device that closely mimics the geometry of the disc nucleus cavity.