Uniformity Explained
Uniformity is the ratio of minimum to average lux. Low uniformity means dark patches even with high average lux.
What Uniformity Measures
U0 = minimum lux ÷ average lux on the working plane. The higher the value, the more even the light distribution.
Why It Matters
A room with 500 lux average and U0 = 0.3 has bright spots and dark patches. The eye constantly re-adapts, causing fatigue. Same lux, U0 = 0.7, feels completely different.
Target Values
| Space | Target U0 |
|---|---|
| Office desks | ≥ 0.60 |
| Office surrounding zone | ≥ 0.40 |
| Circulation | ≥ 0.40 |
| Industrial | ≥ 0.70 |
| Hospitality (architectural intent overrides) | No fixed target |
Common Mistakes
- Designing to average lux only
- Spaced downlights too far apart, dark patches between
- Ignoring U0 in DIALux reports
Professional Recommendation
Always specify lux and uniformity together. Average alone is incomplete.
Lighting Intelligence by Alya
At Ashwamedha Design Solutions, this is part of our Lighting Intelligence practice, every recommendation is validated through DIALux simulation, lux calculations and visual comfort analysis before it reaches a construction site. Alya, our lighting intelligence platform, packages this thinking into reusable design tools.
Frequently Asked Questions
Is U0 = 1.0 ideal?+
For workspaces, higher is better but unnecessary perfection costs energy. 0.6–0.7 is the practical target.
Related Service
Lighting Intelligence & DIALux
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