Total Luminous Flux Calculator

Luminous Flux Calculator

Total Luminous Flux, expressed in lumens (lm), measures the total brightness or intensity of light emitted by a light source.
It gives a complete measurement of the source’s luminosity because it includes all visible light wavelengths.

Evaluating a light source’s brightness or luminous efficacy is the main goal of total luminosity flux.
It helps choose suitable lighting solutions for different applications based on their luminous output and allows comparisons between different light sources.

Understanding Total Luminous Flux:

Common Symbols and Units:

Φv: Luminous flux

lm: Lumen (SI unit of luminous flux)

cd: Candela (SI unit of luminous intensity)

sr: Steradian (SI unit of solid angle)

Key Concepts:

Luminous Intensity: The apparent intensity of light emanating from a specific direction, expressed per unit of solid angle.

Radiant Flux:The aggregate energy output of electromagnetic radiation discharged by an illumination device encompasses infrared, ultraviolet, and visible light spectrums.

Luminous Efficacy: The ratio of luminous flux to radiant flux.

Examples of Luminous Flux:

A 100-watt incandescent lamp emits about 1200 lumens.

A typical LED lamp emits around 800-1000 lumens.

The sun emits approximately 3.8 x 10^26 lumens.


  • Lighting Design and Engineering
  • Energy Efficiency Assessments
  • Architectural Lighting
  • Industrial and Commercial Lighting
  • Automotive Lighting
  • Lighting design and engineering.
  • Photometry and radiometry.
  • Optical engineering.
  • Lighting measurement and testing.

Interesting Facts:

Luminous flux represents the total energy output across all visible wavelengths, weighted accordingly. Energy emitted outside this visible spectrum doesn’t factor into luminous flux calculations. The relationship between luminous flux and radiant flux gives rise to luminous efficacy.

Use our handy online total luminous flux calculator to determine how much useful light a source is emitting. Lumens (lm), a unit of measurement for luminance flux, offer an objective way to quantify the brightness of the light. You may also use this converter to convert luminous intensity to luminous flux, which will give you the light source’s lumen output. With easy, learn what your light source’s luminous flux is capable of.

Note : Don’t end with comma ( , )

Maximum Luminous Intensity (Iv)
Cone Full Angle (θ)




  • Iv = Maximum Luminous Intensity
  • θ = Cone Full Angle
  • Ω = Equivalent Solid Angle
  • F = Total Luminous Flux

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