Ah, I didn't see the Lighthouse. I tried searching the wiki to see what the highest assigned Ke nomenclature was and could only find up to P6. As for the designation itself, the nomenclature system doesn't really give a good option for standalone equipment of this type: it's not personal equipment, it's not a drone, and it's technically not a structure. But the individual items are subcomponents intended for use in planetary and orbital structures, so it seemed like the best fit.
On a more general editing note, there are still a few links I haven't made in the article to some other related Logistics articles - the RLHD, ICHS, and Supply Class pages. I'll try to get those squared away today and linked properly. Likewise, I'll move all of those pages to the proper namespace now that they're going up for approval.