Optical Distance Law

Calculate illumination intensity based on luminous flux and distance from light source using the inverse square law. Also includes the cosine law of illumination for angled surfaces.

Calculator

Inputs

Luminous Flux (Φ) (lumen)

Distance from Light Source (d) (m)

Results

Illumination Intensity (E)-- lux

Calculator

Inputs

Illumination Intensity at Distance 1 (E₁) (lux)

Distance 1 (d₁) (m)

Distance 2 (d₂) (m)

Results

Illumination Intensity at Distance 2 (E₂)-- lux

Calculator

Inputs

Luminous Flux (Φ) (lumen)

Distance from Light Source (d) (m)

Angle (θ) (degrees)

Results

Illumination Intensity with Angle (E)-- lux