Downlight calculators can help document a proposed layout before irreversible ceiling work begins.
What to record
- Room dimensions, ceiling height, and planned fixture locations.
- Spacing-to-height assumptions and whether task lighting is separate.
- Clearances around fans, joists, insulation, wet areas, and manufacturer instructions.
Calculator output is an estimating aid. Confirm project-specific requirements, products, electrical work, and compliance decisions with the responsible professional.