The Easy Led Control 1plus is a controller that allows the Easy Led and Easy Led Universal lamps to be programmed. The controller attaches to the lights' power supply and is programmed at the times you want the lights to turn on and off. At the programmed time, the lights gradually turn on and off, simulating sunrise and sunset. With the Easy Led Control 1, the light intensity of the lamps can be set to the percentage that your fish prefer.