Lux to lumens calculator
Lux to lumens calculator
What Lux to lumens calculator does
The Lux to lumens calculator on RapidTables converts illuminance in lux to luminous flux in lumens by requiring the user to input the light intensity and the surface area. The result provides the total lumens emitted or received, allowing users to bridge the gap between light intensity measurements and total light output. It serves as a practical reference for anyone needing to translate lighting specifications between these two related units of measurement. The site’s version stands out for offering two distinct calculation paths: one using a flat surface area in square meters or feet, and another using a spherical radius for a light source. While many similar calculators only support area input, RapidTables also provides a radius-based formula, giving users more flexibility depending on their specific lighting scenario. The interface clearly separates the two methods with labeled fields and includes a direct link to the reverse conversion tool.
How to use the RapidTables Lux to lumens calculator
- 1
Enter the illuminance value in lux (lx) into the designated field
- 2
Select the area unit type, choosing between square feet or square meters
- 3
Input the surface area in the selected units, or enter the spherical radius if using the radius method
- 4
Press the Calculate button to view the luminous flux result in lumens (lm)
Best for
This option suits lighting designers, engineers, or hobbyists who need to convert lux readings into total lumens output, particularly when the light source geometry is either a defined area or a spherical radius.
Limitations
- Results depend on accurate input of surface area or radius
- No unit switching for the final lumens output beyond the selected area type
- Formula assumes idealized lighting conditions without accounting for real-world fixture efficiency
Lux to lumens calculator FAQ
- Can I calculate lumens from lux without knowing the area?
- No, the calculator requires either a surface area in square meters/feet or a spherical radius to determine the total luminous flux; the area or radius is part of the conversion formula.
- Does the tool support both metric and imperial units?
- Yes, the interface allows you to choose between square meters and square feet for the area input, and the calculations use the appropriate conversion factor for the selected units.
- What is the formula used for the calculation with square meters?
- The luminous flux in lumens is equal to the illuminance in lux multiplied by the surface area in square meters (V(lm) = Ev(lx) × A(m²)).
- Is there a way to calculate lux from lumens on this site?
- Yes, the page includes a direct link to the 'Lux to lumens calculator' which also provides a 'Lumens to lux calculator' for the reverse conversion.