What is Daily Light Integral (DLI)?

DLI is a measure of the total amount of photosynthetically active radiation (PAR) received by a plant over a 24-hour period. It's like a 'daily dose' of light and is a crucial factor for plant growth, more so than just the instantaneous light intensity.

What is a good DLI for my plants?

It varies greatly. Lettuce and herbs might need 12-17 mol/m²/day. Fruiting crops like tomatoes and peppers thrive with 20-30 mol/m²/day. Cannabis can require 30-40+ mol/m²/day during flowering.

How do I find the light intensity of my grow light?

The manufacturer often provides a PAR map or chart showing the light intensity (in μmol/m²/s) at different distances from the light. You can also measure it directly using a PAR meter or a quantum sensor.

Light Requirement (DLI) Calculator

Calculate the Daily Light Integral (DLI) for your plants.

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