Luminous Flux Converter
Convert luminous flux values across lumen-based metric units.
How to Use the Luminous Flux Converter
Enter a luminous flux value, choose the source unit and select the unit you need. The converter translates between lumens, millilumens and kilolumens for lighting specifications and optical calculations.
Practical Example
A light source rated at 2.5 kilolumens produces 2,500 lumens. Likewise, 750 lumens equals 0.75 kilolumens.
Factors That Affect Luminous Flux
The unit conversion is fixed, but measured light output can vary with lamp efficiency, temperature, age, electrical input and measurement conditions. The converter changes units rather than predicting these real-world losses.
Frequently Asked Questions
What is a lumen?
A lumen is the SI-derived unit used to measure luminous flux, or the perceived quantity of visible light emitted by a source.
Are lumens and lux the same?
No. Lumens measure total luminous flux, while lux measures how much luminous flux reaches a square meter of surface.
How many lumens are in one kilolumen?
One kilolumen equals exactly 1,000 lumens.
Unit Relationship and Practical Context
Luminous flux, measured in lumens, represents visible-light output weighted by human visual sensitivity. Converting metric lumen multiples is direct, but lumens cannot be converted to watts without information about spectral output and luminous efficacy.