LUMEN is an interactive energy resilience lab. Plan 72 hours without outside electricity or fuel, test 16 synthetic weather scenarios, and compare solar, wind, batteries and backup within a budget. See how decisions affect hospitals, water, shelters and homes. Built with GPT-6 Astra in ChatGPT Work, which handled the demo from implementation to deployment. Free to try, with no sign-in. Educational simulation with illustrative data.