How much yield per plant is realistic?

Yield per plant depends heavily on conditions. With LED lighting, you can typically expect 0.5–1.2 g/W; with HPS, 0.6–1.0 g/W. Under optimal conditions (quality genetics, perfect nutrients, stable climate), you can achieve 1–1.5 kg/m² with LED and 0.8–1.2 kg/m² with HPS.

LED vs HPS: Which technology gives higher yield?

Modern LED systems now achieve comparable or better yields than HPS, with significantly lower power consumption. LED generates less heat, enables better climate control, and reduces operating costs by 30-50%. HPS is cheaper upfront but consumes more energy per gram of yield.

How do I optimize my cannabis yield per m²?

Optimization requires multiple factors: (1) Correct light intensity (800–1200 µmol/m²/s PPFD), (2) Correct DLI based on growth stage, (3) High-quality genetics, (4) Precise nutrient dosing, (5) Stable climate (20–26°C, 40–60% RH), (6) Adequate CO₂ levels (400–1500 ppm).

What role does PPFD/DLI play in yield?

PPFD (Photosynthetic Photon Flux Density) and DLI (Daily Light Integral) are key factors. A DLI of 17–25 mol/m²/d is optimal for cannabis. Too little light limits yield potential; too much wastes energy. Use our PPFD/DLI calculator to find the ideal balance for your growth stage.

Yield Calculator – Calculate Cannabis Yield per m²

Cannabis yield is every grower's goal. With our interactive yield calculator, quickly calculate your expected harvest based on lighting technology, genetics, growing space, and method. Learn how to achieve optimal yields per m² and per watt with both LED and HPS systems.

Cannabis Yield Fundamentals and Key Factors

Cannabis yield is determined by several major factors. Master these factors, and you can systematically optimize your harvest:

1. Lighting Technology: LED vs HPS

The choice between LED and HPS is one of the most important decisions. Modern high-power LEDs now achieve 0.5–1.2 g/watt, while HPS lamps typically reach 0.6–1.0 g/watt. LEDs offer significantly better energy efficiency and heat management. Learn more in our LED vs HPS comparison.

2. PPFD and DLI – Light Quantity Matters

PPFD (Photosynthetic Photon Flux Density) measures photon density in µmol/m²/s. DLI (Daily Light Integral) is total light per day in mol/m²/d. Cannabis requires:

Vegetative stage: 600–800 µmol/m²/s PPFD, DLI 12–17 mol/m²/d
Flowering stage: 800–1200 µmol/m²/s PPFD, DLI 17–25 mol/m²/d

Use our PPFD/DLI calculator to compute ideal values for your growth stage.

3. Genetics – Auto vs Photo

Strain selection significantly impacts yield potential:

Photoperiodic strains: 1–2 kg/m² possible, longer cycle (8–12 weeks flowering), higher potential
Autoflowering strains: 0.3–0.8 kg/m², faster (8–10 weeks total), multiple harvests per year

4. Growing Medium and Nutrients

Soil, Coco, and Hydro affect yield differently:

Soil: Beginner-friendly, stable, but slower nutrient uptake
Coco: Fast uptake, high control, good yield (0.8–1.2 kg/m²)
Hydro: Highest efficiency and speed, but steeper learning curve

5. Grow Room Size and Optimization

Even in small spaces (<1 m²), you can achieve high-quality yields with optimization. Learn more: Cannabis Grow Room Setup.

Calculate Yield: Formula and Practical Examples

The Basic Formula

Yield (g) = Wattage × Efficiency (g/W) × Optimization Factor

Practical Yield per m² Reference Table

Setup	Lighting Technology	Wattage	Optimal PPFD	Expected Yield	g/Watt
Small Beginner Box (0.5 m²)	LED 100W	100W	700 µmol/m²/s	50–80g	0.5–0.8
1m² Standard Indoor	LED 300W	300W	900 µmol/m²/s	200–350g	0.7–1.2
2m² Professional	LED 600W	600W	1000 µmol/m²/s	600–900g	1.0–1.5
4m² Commercial	LED 1200W	1200W	1100 µmol/m²/s	1.2–1.8 kg	1.0–1.5
1m² HPS Classic	HPS 600W	600W	1100 µmol/m²/s	480–720g	0.8–1.2

Optimize Yield per Watt

The g/watt value is the most important efficiency metric. To maximize it:

Correct light intensity: Not too low, not too high. Optimal PPFD ranges from 900–1100 µmol/m²/s in flowering.
Choose high-yield genetics: Premium strains can achieve 1.5+ g/W.
Nutrient precision: Macro (N-P-K) and micronutrients must be perfectly balanced.
Climate control: 20–26°C, 40–60% RH, adequate CO₂ (400–1500 ppm).
Training & defoliation: Proper techniques like LST, ScrOG, or defoliation boost yield per watt.

Practical Tips for Yield Optimization

1. Choose the Right Light Spectrum

LEDs offer flexible spectra. For cannabis, we recommend:

Vegetative stage: More blue (400–500 nm), ratio about 3:1 Blue:Red
Flowering stage: More red (600–700 nm), ratio about 1:2–1:3 Blue:Red

2. Coordinate DLI and Photoperiod

Higher DLI with shorter photoperiod is more efficient than lower DLI with longer photoperiod. Example: 22 mol/m²/d with 16h light is better than 18 mol/m²/d with 20h.

3. CO₂ Augmentation

With optimal lighting, CO₂ becomes the limiting factor. Passive ventilation achieves ~400 ppm. Active dosing enables 800–1500 ppm and increases yield by 15–30%.

4. Nutrient Timing by Growth Stage

Use our Light Calculator to optimize lighting, combined with precise nutrient management for maximum yield.

5. Harvest Planning and Multi-Crop Strategy

With autoflowering, achieve 3–4 harvests per year. Photoperiodic strains allow mother plant + clones for continuous harvest rotation.

Interactive Yield Calculator

Use our free yield calculator to analyze your setup:

The interactive calculator will be integrated here.

Input: Lighting technology (LED/HPS), wattage, PPFD, growing medium, strain category → get yield projection in grams and g/watt.

Frequently Asked Questions About Cannabis Yield

How much yield with 300W LED?

With 300W LED and optimal conditions, you can achieve 200–350g per cycle. That's about 0.7–1.2 g/watt. Critical factors are correct PPFD (900 µmol/m²/s), quality genetics, and stable climate.

Is 1 kg/m² realistic?

Yes, 1 kg/m² is achievable with modern LED systems, quality genetics, and optimal conditions. This requires:

800+ watts LED (minimum 250W/m²)
PPFD 1000–1200 µmol/m²/s
DLI 22–25 mol/m²/d
High-yield strains
Precise climate and nutrient control

How long is a complete grow cycle?

Photoperiodic strains: 4–8 weeks veg + 8–12 weeks flowering = 12–20 weeks total. Autoflowering: 8–10 weeks from seed to harvest, enabling multiple harvests per year.

Can I achieve good yield with less wattage?

Yes, with optimization. Efficiency (g/W) matters more than raw power. With quality LED, perfect PPFD, high micronutrient uptake, and optimized training, even 150W/m² can deliver solid yields.

What role does genetics play in yield?

Genetics is fundamental. Different strains have intrinsically different yield potential. High-yield strains can achieve 1.5+ g/W, while landrace strains may only reach 0.4–0.6 g/W. Invest in proven, high-yielding strains for better results.

Additional Resources

Deepen your knowledge with our related guides:

Light Calculator – Calculate ideal lighting for your space
PPFD & DLI Calculator – Optimal light quantity and photoperiod
LED vs HPS: Comparison – Detailed analysis of both technologies
Cannabis Grow Room Setup – Complete setup guide

Conclusion: Maximize Your Cannabis Yield

The key to high yield lies in optimizing all factors: lighting technology, PPFD/DLI, genetics, nutrients, climate, and training. Start with data – use our calculators, measure PPFD with a sensor, and adjust based on results. With Photon Flux Nutrients and the right knowledge, you'll consistently achieve high-quality, abundant harvests.