Plan an initial recessed-light count and 2D layout for a rectangular room.
A free browser-based calculator for preliminary general lighting in rectangular rooms. Enter room dimensions and fixture output, compare light-count and spacing options in a 2D layout, and export PNG or CSV. A separate lumen calculator supports editable utilization and maintenance assumptions. Intended as an initial planning aid, not field measurement, a full electrical design, installation approval, or CAD/IES simulation. No account is required.