Fixture Count Rounding Table
Formula-derived examples showing how required lumens, lumens per fitting and rounding affect fixture-count estimates.
Table PDFFixture Count Rounding Table
Download the table with the page URL and retrieval date for offline lighting checks.
| Required lumens | Lumens per fitting | Rounded fixture count | Planning note |
|---|---|---|---|
| 4,800 lm | 800 lm | 6 fittings | Exact division; still note row pattern, wall offsets and control group. |
| 5,000 lm | 800 lm | 7 fittings | Rounding gives 5,600 installed lumens; note overshoot before spacing. |
| 7,200 lm | 900 lm | 8 fittings | Exact division, but symmetry, ceiling services and task positions can still move the layout. |
| 9,600 lm | 900 lm | 11 fittings | The raw count is 10.67; rounding up needs an overshoot and dimming note. |
| 12,500 lm | 1,000 lm | 13 fittings | Rounding adds one fitting; check connected load, glare and one-fewer shortfall. |
| 18,000 lm | 2,400 lm | 8 fittings | Higher-output luminaires can reduce count while changing spacing, shadows and distribution. |