Eulumdat

Eulumdat is a professional photometric data viewer for lighting engineers, designers, and architects. View and analyze LDT (EULUMDAT) and IES photometric files with beautiful interactive diagrams. Features: • Open and view LDT and IES photometric files • Multiple diagram types: Polar, Cartesian, Butterfly, Heatmap, BUG Rating, and LCS • Interactive 3D butterfly diagram visualization • Export diagrams to SVG • Convert between LDT and IES formats • Batch conversion support • Dark and light theme support • QuickLook preview integration (macOS) Perfect for: • Lighting designers reviewing luminaire data • Architects evaluating lighting fixtures • Engineers analyzing photometric distributions • Anyone working with lighting specification files