The sera LED Digital Dimmer is a controller for programming sera LED lighting appliances such as the sera LED X-Change Tubes, sera LED aquaria and the sera LED lights. You can adjust maximum brightness and use the dimmer as a time clock. In Combination with the sera LED X-Change sunrise Tubes sunrise and sunset can be simulated. The sera LED Digital Dimmer allows operating one or more sera LED X-Change Tubes (also different lengths) up to a total of 60W/3A. If you want to connect more than one tube, please use the optionally sera LED Triple Cable. The programming of the sera Digital Dimmer is very simple and easy. There are different setting options possible.sera LED Digital Dimmer+ individually programmable LED controller+ simulates sunrise and sunset+ cloud scenarios+ NEW: midday dimming+ optimal for sera LED X-Change Tubes, sera LED lamps and sera LED aquariums+ incl. Srew holder