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Open Source Horticulture Calculator

Open Source Horticulture Calculator

Calculators for controlled environment growing. Click a tab to open a tool.

Daily Light Integral (DLI)

This calculator helps growers determine the Daily Light Integral (DLI), which represents the total amount of usable light a plant receives each day, measured in moles of light per square meter per day (µmol·m⁻²·s⁻¹).

Daily Light Integral
Effective hours —
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The calculator automatically factors in these ramps and provides your Daily Light Integral (DLI), or the total light delivered to your crop, in µmol·m⁻²·s⁻¹, enabling you to fine-tune light intensity and duration for optimal plant growth and productivity.

Recommended DLI Ranges by Crop & Growth Stage
Lettuce: 12–17
Tomato:
Vegetative: 20–25
Blooming: 25–30
Fruiting: 25–35
Strawberries: 12–20
Cannabis:
Clone: 6–12
Veg: 15–30
Mothers: 20–30
Early Flower: 30–40
Late Flower: 40–60+
Peppers:
Vegetative: 15–20
Blooming: 20–25
Fruiting: 25–30
Cucumbers:
Vegetative: 18–22
Blooming: 22–28
Fruiting: 25–30

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