Design a code-compliant lighting plan with precise fixture spacing.
Quick Answer
For a 20x15 living room, you want relaxed ambient lighting (20 FC). Use about 6 standard 800-lumen recessed cans in a 2x3 grid for even coverage without glare.
This calculator uses the Lumen Method (Zonal Cavity Method) to estimate the number of fixtures required to achieve a desired light level.
Brightness Targets
Standard (30 FC): General purpose rooms, dining, hall.
Bright (50 FC): Kitchens, workshops, offices.
Relaxed (20 FC): Living rooms, bedrooms.
Layout Tips
Even Spacing: Calculated to distribute light uniformly.
Wall Spacing: Should be half the fixture-to-fixture spacing.