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Lumens Calculation:
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This calculator helps determine the total lumens needed for your marijuana grow space based on the area size and desired lumens per square foot. Proper lighting is crucial for healthy plant growth and maximum yield.
The calculator uses a simple formula:
Where:
Explanation: The calculation provides the total lumens output needed from your grow lights to adequately cover your entire grow space.
Details: Marijuana plants require different light intensities at various growth stages. Seedlings need 2,000-3,000 lumens/sq ft, vegetative plants 3,000-7,000 lumens/sq ft, and flowering plants 7,000-10,000 lumens/sq ft.
Tips: Measure your grow space accurately in square feet. Determine the appropriate lumens per square foot based on your plants' growth stage. All values must be positive numbers.
Q1: What's the difference between lumens and PAR?
A: Lumens measure visible light to human eyes, while PAR (Photosynthetically Active Radiation) measures light usable by plants. For precision, PAR meters are better but more expensive.
Q2: Can I have too much light?
A: Yes, excessive light can cause light burn, heat stress, and bleaching. Always maintain proper distance between lights and plants.
Q3: Do different strains need different light levels?
A: Yes, sativa-dominant strains typically tolerate more light than indica-dominant strains. Observe your plants for signs of stress.
Q4: How does light spectrum affect growth?
A: Blue spectrum promotes vegetative growth while red spectrum encourages flowering. Full-spectrum LED lights are ideal for all growth stages.
Q5: Should I consider light reflection in my grow space?
A: Absolutely. Highly reflective walls can increase effective light levels by 20-30%. Factor this in when calculating your needs.