The options module is a 4-channel ballast control unit for use inside the dimmer module, 458/DIM8 & 458 DIM4 or
458-OPT4 4 Channel Option Module (Discontinued)
technical specifications
The options module is a 4-channel ballast control unit for use inside the dimmer module, 458/DIM8 & 458 DIM4 or switching module, 458/SW8. It provides 4 channels of ballast control including 0-10 V, 1-10 V, DSI® , DALI-broadcast and PWM.