The Solatube Smart LED is a Solatube with the addition of LEDs to enable you to light a space at night.   There are twop options: primary LED or primary LED w/ secondary system (another set of LEDs) depending on how much light is required.   A Daylight Sensor continually monitors light levels within the tube and activates the LEDs when light levels reach a minimum threshold.  It also deactivates the LEDs when sufficient daylight is present.  There's even an option for a daylight dimmer in case it's too bright during the day!