Lighting systems were mostly original and had been essentially unchanged since modifications made during the last major renovation in the 1950's. Many of the historic original fixtures have been removed and completely refurbished, including hand-fabrication of all new glass globes to replace those altered during previous renovation projects and to match the original glass components. The main chandeliers in the Nave were restored to their original appearance, while incorporating dual-circuiting and a new uplighting component to gently illuminate the distinct Guastavino-vaulted ceilings. AltieriSeborWieber worked closely with the Renfro Design Group, project lighting designer, to coordinate and implement the new electrical, lighting, and control systems.

A complete upgrade of the existing electrical branch distribution system is also being performed. This will upgrade the wiring of all existing and new lighting systems to meet current Code and safety standards. Many fixtures had still utilized the original lead-coated branch wiring installed in the early 1900's. Extensive site investigation has been required to determine the routing of existing electrical systems within the masonry walls and to determine the most efficient and architecturally-sensitive means to power new lighting systems added to the existing areas. A new central dimming system is also provided to allow pre-set scene control of the lighting during various events in the church. This system is replacing the deteriorating main dimming equipment dating back to the 1950's. AltieriSeborWieber is also currently assisting St.Thomas Church in the removal of their existing DC utility electric service, which still serves the existing air handling systems, organ blower, and elevator equipment. The air handling systems themselves are also being studied to enhance air distribution and comfort within the Church. Lighting renovations were completed in the Fall of 2002. Mechanical renovations will continue for the next several years, based on funding of capital improvements.