Shared Lighting for a Night Market: One Central Solar Tower Against Distributed Lanterns, Priced per Useful Lumen-Hour

Central 20,000-lumen solar tower never beats distributed 400-lumen lanterns on cost per useful lumen-hour ($12.73 floor vs $11.67), becomes cheaper per stall only above 55 stalls, but its edge falls below 10 lux beyond 50 stalls, and it leaves the whole market dark an expected 6 nights per year.