The Control4? 8-Channel 0-10V Dimmer controls up to eight (8) 0-10V dimmable fluorescent ballasts or LEDs. Each channel can control up to 50 ballasts. Individual 0-10V lights can be programmatically tied to a corresponding channel on a Control4? 8-Channel Relay module for on/off control of the ballast or LED when needed. Alternatively, the Control4 8-Channel 0-10V Dimmer module also has eight (8) low-voltage outputs for triggering external power relays.