This started as something I built to plan lighting for home projects, but it turned out to be useful enough that I kept going with it. The goal was pretty simple: make something fast, practical, and easy to use without needing heavy CAD software.

What it does

Lightmap Studio lets you draw a room and see how light is actually distributed inside it. You can draw rooms with walls and structural elements, place and configure light fixtures, import IES photometric files and analyze how light is distributed across a space .

Lighting analysis

• Illuminance calculations in lux
• Heatmaps for visualizing light distribution
• Identification of under-lit areas
• Fixture spacing analysis
• Summary statistics such as average levels and uniformity

I mainly built this so I could answer basic questions like “is this area too dim?” or “are these lights spaced correctly?” without guessing.

Features

• Interactive room drawing with grid snapping
• Measurement tools for accurate layouts
• Custom light properties including lumen output and beam angle
• Multiple view modes for design and analysis
• Undo and redo support
• Autosaves in the browser with export option

This project is completely open-source: https://github.com/warrengalyen/Lightmap