Recessed Light Calculator

Submitted by its maintainer: a free browser tool for preliminary general-lighting planning in rectangular rooms. Edit room and fixture inputs, inspect a 2D layout, and export PNG or CSV. The main planner uses fixed UF/LLF factors; a separate lumen calculator makes them editable. Built using Codex, ChatGPT and Claude Code; the maintainer estimates about 80% AI-assisted coding. This describes development, not a runtime AI feature. No measured photometry, IES/CAD integration, complete electrical design or installation approval is claimed. Build time, specific prompts, model versions and personal origin story are not asserted.