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Fixtures Needed
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Total Lumens Required
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Fixture Spacing
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Actual Lumens/sq ft
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Room Area
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For general living areas, use 20-30 lumens per sq ft. Task areas like kitchens or offices need 30-50 lumens per sq ft. Ambient lighting requires only 10-20 lumens per sq ft.
A spacing factor of 1.5 is standard for most applications, providing balanced coverage. Use 1.0 for uniform lighting in critical areas, or 2.0 for cost-effective general illumination.
Higher ceilings require more powerful fixtures or closer spacing. For every foot above 10 feet, consider increasing lumens per fixture by 10-15% to maintain adequate ground-level illumination.
Grid layout provides the most uniform coverage and is recommended for most rooms. Linear rows work well for long, narrow spaces. Perimeter lighting is ideal for accent or ambient applications.
For irregular rooms, divide the space into rectangular sections and calculate each separately. Focus on maintaining consistent spacing ratios and avoiding dark spots in corners or alcoves.
Lumens measure total light output from a source, while foot candles measure illumination at a surface. One foot candle equals one lumen per square foot at the surface being measured.
Yes, but maintain consistent spacing and adjust for different light outputs. Higher wattage fixtures can be spaced further apart, while lower wattage fixtures need closer spacing for uniform coverage.