Light Uniformity
How evenly light is distributed across the crop canopy. Good light uniformity reduces weak spots, hot spots, and inconsistent growth across a room or bench.
Light uniformity describes how evenly PPFD is distributed across the crop canopy. It is usually assessed by taking multiple light measurements across a grid and comparing the lowest, highest, and average readings.
In indoor cultivation, uniformity matters because plants in low-light areas may grow slowly while plants under hot spots may receive excessive intensity or dry down faster. Better uniformity makes irrigation, nutrition, pruning, and crop timing easier to manage across the whole space.
Common ways to evaluate uniformity:
- Minimum PPFD divided by average PPFD
- Minimum PPFD divided by maximum PPFD
- PPFD maps from fixture manufacturers or field measurements
- Canopy-level spot checks after installation
Uniformity is influenced by fixture spacing, mounting height, beam angle, reflectivity, aisle layout, canopy height, and dimming strategy. A lighting design should balance target PPFD, DLI, energy use, and even coverage rather than focusing only on peak readings.
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