Add and configure a calculation grid

Calculation grids tell OpenLumen *where* to compute light levels. You can have multiple areas in one layout (parking lot, driveway, "no light spill" zone, etc.), each with its own targets.

1. Switch to the Areas tab

   In the right panel, choose Areas. This panel is where you create the rectangular or polygonal regions that become calculation grids.

2. Draw the area

   Click Rectangle for a quick axis-aligned grid, or Draw to trace a freeform polygon point-by-point. Click on the canvas to place the corners; double-click to finish a polygon.

   Each area can have its own color so it's easy to tell them apart in the legend and the report.

3. Configure target footcandles and grid spacing

   With the area selected, the right panel shows its properties. Set the Target FC so OpenLumen can highlight points that fall short, and adjust Grid spacing to control how dense the calculation point grid is. Smaller spacing = more accurate but slower to recalculate.

   You can also set Mounting height, Wall height, and Ceiling type — those values feed into the illuminance formula.

4. Read the live results

   As soon as you have an area defined and at least one fixture aimed at it, the Areas sidebar on the left shows live numbers: average, min, max, and uniformity ratios. The bottom Areas / Fixtures List / Luminaire Schedule tabs give you a tabular view to copy/paste into a report.