Lux / Illuminance Estimator

Toolbox Lighting Lux / Illuminance Estimator
Lux / Illuminance Estimator

Estimate illuminance at a target distance using either lumens + beam angle or a datasheet value of lux at 1m.

Guidance only: real results vary with optics, beam profile, losses, ambient light, and measurement method. Treat as a quick estimate, not a photometric plan.

Beam radius (m) = distance × tan(beam angle ÷ 2)
Beam area (m²) = π × radius²
Lux (lx) ≈ lumens ÷ area

Lux at distance (lx) = lux@1m ÷ distance²

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