.ULD File Extension
What is a ULD file?
Data file used by DIALux, a professional light planning software for indoor and outdoor lighting; contains data about the lighting specifications of a luminaire, such as the fixture description, fixture image, luminous flux, power consumption, and a 3D model for viewing; cannot be created by the user, only used for viewing.
DIALux is a free program used to design and plan lighting installations for different environments with different room elements. Commonly used for homes, office buildings, neighborhoods, sporting facilities, and commercial sites.