The DALI is a non-proprietary digital communication protocol that allows communications between a DALI ballast and the lighting system. Tridonics, Advance Transformer, and OSRAM SYLVANIA currently offer DALI ballasts. The key features of the DALI ballast enable:

• Two-way communications for obtaining operating status and performance of luminaires.
• Individual fixture control which allows users to re-configure space lighting groups without changing the wiring, easily implement load-shedding functions, and integrate a fixture into multiple control zones.
• The user to mix and match ballasts from multiple suppliers and obtain consistent control operation.
• The elimination of costly installation errors due to reversing control wiring at ballast or control terminals.
• The easy addition of DALI-based wall controls and other devices because a two-wire communications bus is used. This feature greatly reduces labor and installation costs.