LED Cultivation Manual

System Characteristics

• Power per unit: 600W - 730W (actual draw).

• Coverage per unit: ~1.2 m² per fixture.

• Recommended plant density:

  • Sea of Green (SOG): 9-16 plants/m² (small pots 5-7L).

  • Screen of Green (SCROG): 4-6 plants/m² (pots 11-20L).

Environmental Control in Large Rooms

Forced Ventilation:

• Strong extraction (calculate at least 300-400 m³/h per m²).

• Cross air circulation (large oscillating fans).

• Controlled fresh air intake.

Dehumidification:

• Very important during flowering (strict RH control).

Target Temperature:

• Day: 24-26°C

• Night: 20-22°C

Relative Humidity:

• Vegetative: 55-70%

• Early flowering: 50-60%

• Late flowering: 40-45%

⚠ The larger the space, the more stable the climate, but also higher risks of mold or pests if not fully controlled.

Cultivation Phases

🌱 Germination (0-10 days)

• LED Power: 20-30% (120W-200W per fixture).

• LED Height: 70-80 cm.

• Photoperiod: 18/6.

• Humidity: 70-80%.

• Watering: Spraying or light micro-watering.

🌿 Vegetative Stage (3-5 weeks)

• LED Power: 40-60% (240W-400W).

• LED Height: 50-60 cm.

• Photoperiod: 18/6.

• Humidity: 60-70%.

• Nutrients: Nitrogen-rich.

• Training:

  • LST and SCROG are ideal for Spider LEDs (taking advantage of full coverage).

  • Topping can be done early.

🌸 Flowering Stage (8-10 weeks)

Transition (Week 1-2 flowering)

• LED Power: 70-80% (450W-580W).

• LED Height: 50 cm.

• Photoperiod: 12/12.

• Humidity: 50-55%.

Full Flowering (Week 3-8)

• LED Power: 90-100% (600W-730W).

• LED Height: 40-45 cm.

• Photoperiod: 12/12.

• Humidity: 45-50%.

• CO₂ (optional): 900-1200 ppm (if PPFD > 1000 µmol/m²/s).

Late Flowering (Last 10-14 days)

• LED Power: 80-100% (depending on plant development).

• LED Height: 40-45 cm.

• Watering: Root flushing.

• Humidity: 40-45%.

• Temperature: 20-24°C.

PPFD Parameters (with well-distributed Spider LEDs)

Bar-style LEDs allow uniformity and deep canopy penetration without burning if climate is properly controlled.

Large-Scale Grow Room Management

✅ Automated Climate Control

• Integrated environmental control systems (extraction, dehumidification, temperature, CO₂ controllers).

✅ Continuous PPFD and DLI Monitoring

• Use PAR meters and calculate DLI (Daily Light Integral) to maximize yield.

✅ Light Uniformity

• Spider LEDs offer excellent coverage: maintain even spacing and level SCROG nets.

✅ Preventive Pest Management

• Bio-control, constant cleaning, regular leaf inspections.

✅ Precise Nutrient Management

• Measure EC and pH at every watering.

• Set up automatic irrigation or scheduled feeding programs (even better with controlled drip systems).

Estimated Yield

With a well-tuned system:

• Expected yield: 1.2 - 2.0 grams per actual watt
  (This means 700W = 800g to 1400g depending on management and genetics.)

🔧 LED Power Adjustment Summary by Stage