Recessed lighting layout — spacing equals half the ceiling height, first row at half the spacing
The even-coverage rule: spacing = ceiling height ÷ 2 (4 ft under an 8-ft ceiling), with the first row a half-spacing (2 ft) off the walls.
What this diagram shows
Plan view of a 12 by 8 foot room with an 8-foot ceiling showing the standard recessed lighting layout rule: fixture spacing equals the ceiling height divided by two, giving 4-foot spacing, and the first row sits half a spacing — 2 feet — from each wall. The result is a 3 by 2 grid of six downlights with even coverage and no dark perimeter.
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Recessed Lighting Calculator
How many recessed lights do you need? Free calculator for fixture count, grid spacing, and wall offsets — with a brightness check for your room type.
