How to Space Recessed Lights Correctly
The most widely used rule of thumb for recessed lighting spacing is to divide the ceiling height by two. For a standard 8-foot ceiling, that means placing lights roughly 4 feet apart. This produces even, overlapping light cones that eliminate dark spots without creating harsh bright zones directly beneath each fixture. The first light in each row should be placed half the spacing distance from the wall, so for a 4-foot spacing the first light sits 2 feet from the wall.
Getting the layout right matters for both aesthetics and function. Lights that are too far apart create noticeable dark patches between pools of light, while lights spaced too closely waste energy and can make a ceiling look cluttered. This calculator applies the ceiling-height-divided-by-two rule automatically and generates a visual layout diagram so you can see exactly where each fixture should go before you start cutting holes.
For kitchens and task areas, some electricians prefer tighter spacing (ceiling height divided by 2.5) to increase brightness where it counts. For ambient living room lighting, wider spacing can work if supplemented by lamps or accent lighting. Always check local code requirements for recessed fixture clearances from insulation and combustible materials.