Extract text from Luminaire data files (LTL)
To convert LTL Luminaire data to another format, you need DIALux or other Data software.
To convert other file formats to the "Luminaire Photometric File" file type, you need software like DIALux or a similar tool.
The .LTL format is a Luminaire Data File originally tied to Danish photometric testing standards (LTLI) and primarily utilized by professional lighting calculation software like DIALux and Relux. It contains crucial spatial and electrical data about a specific physical light fixture - including its luminous flux, power consumption, beam angle, and 3D light intensity distribution matrix. These measurements are typically recorded in a laboratory environment using a goniophotometer to map the precise shape of the light emission.
While highly precise for simulating real-world lighting in architectural environments, the .LTL format suffers from significant cross-platform compatibility limitations. It is a regional standard that is vastly less recognized than global photometric formats. If you attempt to import an .LTL file into standard 3D rendering and CAD suites like AutoCAD, SketchUp, or 3ds Max, the import will almost always fail because these programs do not natively parse the specialized LTLI ASCII data structure.
To ensure your photometric webs are readable by external engineering and architectural teams, converting your .LTL files to globally adopted standards is a necessary workaround. The best conversion targets are IES (the primary standard for North America) or LDT (the Eulumdat standard for Europe). Because .LTL files are fundamentally structured as plain text matrices, developers and engineers can also convert them to TXT or CSV to parse the raw coordinate grids programmatically.
Converting photometric matrices is notoriously difficult because standard online tools do not understand the spatial geometry algorithms required to map light distribution correctly from one standard to another. If our engine detects a supported photometric framework, viewing or safe conversion to a more universal format may still be possible without losing mathematical accuracy.
Convert.Guru analyzes your LTL file, detects the exact format, and lets you read the text inside.
Users also converted OTF, EFS and FF1PKL files.
If you want to convert LTL file to DWG, DXF, DGN, RVT, RFA, SKP, 3DM, STEP, IGES, SAT, X_T or X_B, you can use DIALux or similar software from the "Luminaire Photometric Data Storage" category. In the File menu, look for Save As… or Export….
To convert SLDASM, DGN, PRT, IAM, X_B, CATPRODUCT, SLDPRT, RVT, ASM, DWG, CATPART or DXF files to LTL, try DIALux or another comparable tool in the "Luminaire Photometric Data Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our LTL converter.