Lumens to candela calculator
Lumens to candela calculator
What Lumens to candela calculator does
This calculator converts luminous flux measured in lumens to luminous intensity in candelas. It requires two inputs: the luminous flux in lumens and the apex angle in degrees. The tool applies the photometric formula that accounts for the solid angle of the light source, producing a candela value suitable for optical and lighting calculations. The result is displayed immediately, and the page also provides the reverse conversion from candela to lumens alongside a suite of related lighting calculators. The interface is minimal and functional, focusing on the mathematical relationship between the units rather than offering extraneous features. It serves as a direct reference for professionals and students needing quick, accurate conversions without navigating complex software.
How to use the RapidTables Lumens to candela calculator
- 1
Enter the luminous flux value in lumens (lm) into the first field
- 2
Input the apex angle in degrees to define the light cone's spread
- 3
Press the Calculate button to generate the luminous intensity in candela (cd)
- 4
Review the output, which shows the converted candela value based on the provided inputs
- 5
Use the provided formula references on the page if manual verification is needed
Best for
Engineering students, lighting designers, and optics professionals who need to convert between luminous flux and intensity for photometric calculations.
Limitations
- Requires an apex angle input; cannot convert lumens to candela for a generic isotropic source without angle data
- Results are based on the mathematical formula and assume uniform, isotropic light distribution
- No unit switching options beyond the standard lumens and candela outputs
Lumens to candela calculator FAQ
- Can I convert lumens to candela without knowing the apex angle?
- No, the calculator requires the apex angle in degrees to compute the solid angle in steradians, which is essential for the conversion from lumens to candela.
- What is the formula used for the lumens to candela conversion?
- The tool uses the formula cd = lm / (2 × (1 - cos(degrees/2))), where the solid angle in steradians is derived from the apex angle.
- Is this calculator suitable for all types of light sources?
- It is designed for uniform, isotropic light sources where the light distribution follows the mathematical model; non-uniform sources may produce less accurate results.
- Does the site offer a reverse conversion from candela to lumens?
- Yes, the page includes a separate 'Candela to lumens calculator' for converting luminous intensity back into luminous flux.