Lighting
Illumination Uniformity Calculator
Illumination Uniformity converts the entered electrical measurements into uniformity ratio. Use it to the uniformity ratio calculation.
Enter values for uniformity ratio
Use one consistent electrical operating case for all fields.
How Illumination Uniformity works
For Illumination Uniformity, use uniformity = minimum ÷ average × 100. Illumination Uniformity uses Minimum illuminance, Average illuminance to report Uniformity ratio.
With the loaded values, uniformity ratio evaluates to 66.67%. Test minimum illuminance separately and preserve the baseline uniformity ratio. For fixture spacing, use Light Fixture Spacing Calculator.
Inputs for Illumination Uniformity
Minimum illuminance and Average illuminance belong to Illumination Uniformity. Keep source units with minimum illuminance.
The Illumination Uniformity defaults demonstrate arithmetic only. Replace minimum illuminance with case-specific data.
- Minimum illuminance
- Example entry: 280 lx.
- Average illuminance
- Example entry: 420 lx.
Reading the Illumination Uniformity result
This output represents Illumination Uniformity.
Before selecting equipment for Illumination Uniformity, compare uniformity ratio with available ratings and operating limits.
Measurement and units
Photometric results depend on fixture distribution, reflectance, mounting, maintenance, and the measured task plane. Check prefixes on minimum illuminance.
Keep the minimum illuminance unit and measurement point consistent across Illumination Uniformity cases.
Limits of this calculation
Use readings from a documented measurement grid. Driver output power belongs in the separate LED Driver Current worksheet.
Only the listed Illumination Uniformity inputs contribute to uniformity ratio. Unentered effects remain outside Illumination Uniformity.
Questions about Illumination Uniformity
What does Illumination Uniformity calculate?
Illumination Uniformity reports uniformity ratio.
Can Minimum illuminance be zero?
For Illumination Uniformity, measure any zero minimum illuminance directly.
Why can uniformity ratio differ from measurement?
Use readings from a documented measurement grid. Recheck minimum illuminance.