इनव्हर्स-स्क्वेअर लॉ आणि वनस्पती वाढीच्या टप्प्यानुसार शिफारसी वापरून ग्रो लाइटच्या रेटेड PPFD किंवा luxवरून कॅनोपीवरील प्रकाश तीव्रता मोजा.
| Distance | PPFD (µmol/m²/s) | Approx lux |
|---|
Light intensity falls off with the inverse square of distance: I₂ = I₁ × (d₁ / d₂)². Doubling distance cuts intensity to a quarter.
PPFD → lux: for white LEDs roughly 1 PPFD ≈ 54 lux. For HPS ≈ 82 lux. Plants care about PPFD (photosynthetically active 400–700 nm), not lux — but lux meters are cheaper.
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