Definition
Warehouse lumen requirements scale with mounting height and target lux. For a 30ft (9m) ceiling at 200 lux: using the lumen method with typical coefficients, each fixture should deliver 25,000-30,000 lumens (200-250W LED at 130 lm/W). Aisle width matters: narrow aisles (2.5m) with tall racking need narrower beams (60-90°) to avoid lighting rack tops instead of the floor. Wide aisles (4m+) can use wider distribution (90-120°).
Key Data
| Parameter | Value / Explanation |
|---|---|
| 30ft (9m) ceiling | 25,000-30,000 lm per fixture for 150-200 lux |
| 20ft (6m) ceiling | 15,000-20,000 lm per fixture for 150-200 lux |
| Per m² requirement | ~400-500 lumens/m² (delivered) for warehouse at 200 lux |
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Conclusion & Procurement Recommendation
Specify delivered lumens (system level), not chip lumens. Optical losses in the reflector/lens reduce chip lumens by 10-20%. Always request the complete luminaire LM-79 report showing delivered lumens, not the LED manufacturer's chip lumen rating.