Lux to lumen converter

About This Tool

The tool performs a straightforward photometric calculation to convert illuminance in lux to luminous flux in lumens for a defined area. It accepts two primary numeric inputs: illuminance (lux) and area (square meters). The primary output is total lumens, computed as lumen = lux × area. It also supports a two-way mode to derive illuminance from lumen when the area is known, enabling quick back‑calculations for design constraints.
It adheres to SI units and is designed for preliminary sizing, educational demonstrations, and quick sanity checks rather than project‑level photometric validation. Example scenario: a 25 m² conference room at 300 lux yields 7500 lumens (300 × 25). The tool can also handle area input in square feet by converting to square meters internally (1 ft² = 0.092903 m²) for consistent results.
It does not model luminaire distribution, surface reflectance, daylight contributions, or glare. It assumes uniform illumination and fixed luminous output, making it a fast calculator for planning and teaching. This tool is particularly valuable for students learning photometry and professionals performing quick checks before committing to detailed simulations.
The two-way mode, unit handling, and transparent calculations help users verify assumptions and communicate results with stakeholders. By separating inputs, outputs, and the underlying formula, the tool supports auditable workflows in educational settings and early-stage design discussions.

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