The 24VDC SMART BALLAST 14″ Ultraviolet lamp is designed to clean the air as it flows through the evaporator coil and surrounding areas. Utilizing Ultraviolet-C technology emitting light at 253.7nm, it has been proven highly effective in hospitals for many years, significantly reducing the transmission of airborne diseases. The package includes: 1) The UCV bulb, 2) the 24VDC ballast (with a 5-foot cord for connection to a 24VDC power source and a 5-foot cord to the bulb), and 3) the Z-bracket with a magnet for easy installation. The bulb has been tested to be 99% efficient on a single pass. EPA Est. No. 97544-CHN-1. WARNING: This lamp must be powered by a 24 Volts DC power source and cannot be connected to a 24 Volts AC control unit, as it can damage both the lamp and your A/C unit.WARNING: This lamp must be powered by a 24 Volts DC power source and cannot be connected to a 24 Volts AC control unit, as it can damage both the lamp and your A/C unit. The package includes: 1) The UCV bulb, 2) the 24VDC ballast (with a 5-foot cord for connection to a 24VDC power source and a 5-foot cord to the bulb), and 3) the Z-bracket with a magnet for easy installation. The 24VDC SMART BALLAST 14″ Ultraviolet lamp is designed to clean the air as it flows through the evaporator coil and surrounding areas.