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Recessed Light Photometric Grid Calculator

Plan a centered grid from luminaire spacing criteria and height above the work plane; get fixture counts, pitch, offsets and actual coordinates.

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Inputs that matter
Luminaire, optic and photometric report, Recessed mounting-plane height (ft), Work-plane height above floor (ft), Room length (ft), and 4 more
Output to expect
Recessed-light photometric grid
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Recessed-light photometric grid

Create a centered rectangular grid using the exact luminaire's spacing criteria in two directions and its height above the work plane. This supports initial direct-light uniformity planning; it does not determine target illuminance, glare, wall washing or task-light placement.

Maximum pitch X/Y = SC X/Y × (ceiling height − work-plane height). Grid counts = ceil(room dimension / maximum pitch); actual pitch = dimension / count.

Updated: September 2026

Example Scenarios

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ 3 × 3 grid · 9 positions

FAQ

Create a centered rectangular grid using the exact luminaire's spacing criteria in two directions and its height above the work plane. This supports initial direct-light uniformity planning; it does not determine target illuminance, glare, wall washing or task-light placement.

Use the exact equipment, dimensions, current ratings, operating conditions and applicable requirements described in the selected mode. Unknown values are not replaced by a generic wire, device count or capacity. Illustrative examples are arithmetic examples, not an approved installation.

Save planning case keeps an explicit local history entry. Copy MD retains current inputs, source notes and interpretation; Download CSV exports the current result breakdown. Export a separate copy before changing devices or clearing browser storage.

About Recessed Light Photometric Grid Calculator

Create a centered rectangular grid using the exact luminaire's spacing criteria in two directions and its height above the work plane. This supports initial direct-light uniformity planning; it does not determine target illuminance, glare, wall washing or task-light placement.