PRINT SPEC. SHEET Inverse Ratio Series"True Inverse Ratio Control" - Reduces Burn Time - Saves Energy Ripley’s microcontroller technology presents a True Inverse Ratio Photocontrol that provides a precise Turn-OFF light level lower than the Turn-ON level Purchase Online Contact a Rep Exclusive Features Zero Cross Switching Technology:protects the device from inrush currents commonly found in LED Luminaires. SELF_Healing Relay:Our Patent Pending technology actually works to un-stick the contacts allowing unattended field restoration. 3 Tier Power Supply Circuitry:640 Joule MOV rated, Dual Zener Diode and a precision voltage regulator. Intelligent Microprocessor:assures advanced Performance & Reliability. Tru-Filter®:spectral sensitivity matches that of the Human Eye.