Solatube tubular daylighting devices, or TDDs for short, are affordable, high-performance lighting solutions that bring daylight into interior spaces where traditional skylights and windows simply can’t reach. Sometimes called “tubular skylights,” “light tubes,” “sun pipes,” and even “light tunnels,” TDDs have become the ideal solution for lighting interiors in a cost-effective, energy-efficient and eco-friendly way because they significantly reduce the need for electricity while keeping people connected to the outdoor environment.