Grow Light Calculator
Grow Area (sq ft)
Growth Stage
Grow light calculators match light intensity (PPFD) and power to the plant's growth stage. LED grow lights are the most efficient choice at 80–120+ lumens per watt.
- 1PPFD (μmol/m²/s): seedlings 100–300; veg 400–600; flower 600–900
- 2Wattage guide: ~20–50W per sq ft depending on growth stage
- 3DLI = PPFD × photoperiod hours / 10,000
- 4Higher DLI = faster growth (to a point)
6 sq ft grow tent, flowering stage=Target PPFD 600–900; wattage: 6 × 40W = 240W LED
| Stage | PPFD target | Photoperiod |
|---|---|---|
| Seedlings | 100–300 | 18h on / 6h off |
| Vegetative | 400–600 | 18h / 6h |
| Flowering | 600–900 | 12h / 12h |
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