Solatube International, Inc. has revolutionized the way daylight is brought into a building. Known as a tubular daylighting device (TDD), their products are a compact and leak-proof alternative to traditional skylights, virtually eliminating glare and minimizing solar heat gain. Solatube tubular daylighting systems are modular and can be installed in hard-to-reach spaces and rooms, skirting obstacles where skylights can’t reach.