Recessed lighting spacing — ceiling height ÷ 2
Space recessed lights at half the ceiling height, first row a half-space off the wall — then check lumens against the room’s foot-candle target.
What this diagram shows
A room section showing a ceiling with recessed downlights and their overlapping light cones. The spacing between lights (S) equals the ceiling height divided by 2, and the first row sits a half-spacing (S over 2) off the wall. An 8-foot ceiling gives about 4-foot spacing with the first row about 2 feet off the wall. Spacing gives even light; a separate foot-candle check confirms it is bright enough.
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