Hi Clay,
The footprints shown by some manufacturer-provided light fixtures in Land F/X are not an appropriate tool for designing for footcandle requirements -- rather they're a visual aid for the beamspread of the light fixture. (Specifically, the border of the footprint or cone represents the angle at which the light intensity is 50% of maximum).
A footcandle/lux focused tool is probably one of the most requested items on the wishlist of lighting design features. Unfortunately I don't have an ETA on that, but it won't be in 2025. With that said, if you have any examples, resources, or suggestions you could share about how you'd like to see such a tool work, that would be greatly appreciated and help the development process.
In the meantime, I'll make a note on the wishlist item that you expressed interest.
Alex