Within all of the interior areas, the lighting system is designed for 35 footcandles. As a backup system, emergency lighting, Holophane's EH-12 units, are installed in all of the above mentioned buildings, office areas, and the Generator Building, which is illuminated with fluorescent fixtures because of the drop acoustical tile ceiling. The emergency units provide minimum levels of illumination to allow employees to continue to operate the facility. The Clearwell Building, with the exception of a small storage area , is open to the environment. The two tanks in this area, which Lee describes as large concrete swimming pools, are enclosed with lighting fixtures mounted on top, approximately 12 feet above the ground.
Lighting fixtures have to be able to stand up to constant exposure to the elements.
The fixtures have die cast aluminum housing and a clear corrosion-resistant coating. They are mounted on top of the platform on 16-foot square steel poles painted with epoxy paint. County zoning requires a minimum of 1.5 footcandles outdoors. Bantam fixtures are also used in the Chemical Containment Area, an exposed storage area with large plastic tanks containing sodium hydroxide and sulfuric acid. The area is illuminated at night for operator safety.