Lighting
Lux Lumens Calculator
Lux Lumens reports average illuminance from one operating case.
Enter values for average illuminance
Use one consistent electrical operating case for all fields.
How Lux Lumens works
The calculation uses lux = lumens ÷ area. Lux Lumens uses Lumens reaching surface, Surface area to report Average illuminance.
With the loaded values, average illuminance evaluates to 200.00 lx. Preserve the baseline before changing a value.
Inputs for Lux Lumens
Lumens reaching surface and Surface area belong to Lux Lumens. Keep source units with lumens reaching surface.
The preset case is instructional rather than prescriptive. Enter the applicable electrical data. Use Lighting Wall-Plug Efficiency Calculator as the follow-up for wall-plug efficiency.
- Lumens reaching surface
- Example entry: 4000 lm.
- Surface area
- Example entry: 20 m².
Reading the Lux Lumens result
This output represents Lux Lumens. For daylight factor, use Daylight Factor Calculator.
Finish the selection with standard sizes, operating limits, and transient review.
Measurement and units
Photometric results depend on fixture distribution, reflectance, mounting, maintenance, and the measured task plane. Check prefixes on lumens reaching surface.
Keep the same electrical reference points across saved cases.
Limits of this calculation
Uniform distribution is assumed.
A complete system can contain effects that this equation does not represent. Unentered effects remain outside Lux Lumens. Compare this result with Foot-Candles Lux Calculator when illuminance is also needed.
A useful Lux Lumens comparison
Record average illuminance before testing a different lumens reaching surface value. If the next question concerns voltage loss, open LED Strip Voltage Loss Calculator.
Document the alternate lumens reaching surface source.