Hosted browser workflow
Normal Lumen play does not require the GM to expose a local server.
VTT without server hosting
Some groups love the control of self-hosting. Others just want to send a link and play. Lumen is aimed at the second group: browser access, 5e automation, and no self-hosted game server for normal use.
Self-hosting can offer control, but it adds networking and maintenance questions. Lumen chooses a hosted browser product shape for lower setup friction.
A DM already prepares maps, encounters, NPCs, music, and rules moments. Removing server setup keeps technical work from becoming part of session prep.
Ask whether players can join reliably, whether the GM has to manage network access, and whether the hosting model creates extra maintenance before game night.
Lumen fits groups that want D&D 5e automation, live table views, phone controls, and online play without managing a game server.
Normal Lumen play does not require the GM to expose a local server.
The point is to spend fewer decisions on hosting and more on the session.
No self-hosting does not mean no online table.