Work Breakdown Structufor SCSC

Taking a lunar base as an example (although this somewhat applies to
an orbital settlement as well): such a facility would be
underground, with at least two meters of rock between the habitat
and the surface. Energy collected on the surface (huge solar
panels? some kind of Stirling engine? doesn't matter) would be
converted to electricity and then piped into the facility, where it
would again be converted to light (probably fluorescent) to grow the
plants. There wouldn't be any windows, or if any surely not on the
scale of Biosphere 2. Such a setup might be OK for a partially-closed LSS for a base with a few tens of people, but probably not for permanent human settlements on the scale O'Neill envisioned. I'd agree with O'Neill that electrical efficiency losses at that scale would leave using natural sunlight for agriculture as the onlypractical alternative. Which will mean large windows, even if they are behind radiation shields.