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DLI Calculator for Cannabis Growers

Use this tool to calculate your Daily Light Integral (DLI) based on your average PPFD and daily light hours.

What is DLI?

DLI (Daily Light Integral) is the total amount of light your plants receive in a day, measured in mol/m²/day. It combines light intensity (PPFD) and hours of light.

How to Measure PPFD

PPFD (Photosynthetic Photon Flux Density) is the intensity of light at the plant canopy. You can:

• Use a PAR meter
• Check manufacturer PPFD maps
• Estimate based on tent size and light type

Frequently Asked Questions

What is a good DLI for cannabis?
Seedlings: 10–15 | Veg: 20–30 | Flower: 30–50+

How do I increase DLI?
Increase intensity (PPFD) or extend light hours. This tool helps you balance both.

What if my DLI is too high?
Reduce intensity or hours. Watch for light stress signs like curling or bleaching.

What kind of grow light should I use?
We recommend full-spectrum LEDs. Learn more here →

Where can I buy the right grow light?
Browse our collection →