Light Unit Converter
Convert lumens, lux, candelas, footcandles and watts using beam angle, distance and luminous efficacy.
Lux = candela / distance². Candelas = lumens / solid angle, where the cone solid angle is 2π(1 − cos θ). Efficacy reference: incandescent ≈ 15, fluorescent ≈ 60–100, LED ≈ 80–150 lm/W. Values assume a point source with uniform intensity inside the beam.
About Light Unit Converter
Convert lumens, lux, candelas, footcandles and watts using beam angle, distance and luminous efficacy.
As a Conversion tool, Light Unit Converter converts between units instantly — type a value, pick the source and target units, and the result updates live as you type, so you never have to do the math by hand.
How to Use Light Unit Converter
- Enter the value you want to convert in the input field.
- Select the source unit and the target unit.
- Read the result instantly — it updates live as you type.
- Copy the output or swap the units to convert in the other direction.
Key Features
- Live two-way conversion — edit either side and both update together.
- Uses standard, precise conversion factors for everyday and technical use.
- Runs entirely in your browser — works offline and sends nothing anywhere.
Frequently Asked Questions
How accurate are the conversions from Light Unit Converter?
Conversions use standard published factors, and rounding happens only at display time. Results are precise enough for everyday, academic and engineering use.
Is Light Unit Converter free to use?
Yes. Light Unit Converter is completely free with unlimited use — no account, download or payment required.
Is my data uploaded to a server?
No. Light Unit Converter runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.
Does Light Unit Converter work on mobile?
Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.
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