The EL2F is capable of controlling up to 80 lights, 2 rooms, 2 x EC fans, 2 x ECMs (external contactor module) (sold seperately) for heaters, humidifiers, dehumidifers, CO2 etc.
The EL F controllers are new to the family. Not only do they offer everything the Gen 2 controller has to offer in control and safety, but they also provide integrated, intelligent fan control, based on a PID algorithm:
0-10V EC fan control
Intelligent PID fan control