The luminaire output is not quite right in the file. If I amend it, will my calculations use the amended information?
You might have to use the built-in help for LDTeditor because I've crawled the available websites through Google Search and couldn't find anything available for your inquiry. Because of that, I recommend checking the built-in Help section of the program (look in the installation folder as well) or send an inquiry to the developers of LDTeditor. They should provide all the necessary info about this.
Here is the website: https://www.dial.de/en/software/ldt-editor/