Light. Data. Growth. Smarter cultivation starts here.
PPFD tells you how much light actually reaches your plants. Just enter your light’s output (from the box or spec sheet) and your grow area size below.
Ideal PPFD ranges: Seedlings: 100–300, Veg: 300–600, Flower: 600–1000+ μmol/m²/s.
PPFD Calculator for Grow Light Coverage
Estimate how much light hits your plant canopy by entering your light’s total output and grow area size.
Seedling
Veg
Flower
Frequently Asked Questions
Q: What is PPFD?
A: PPFD stands for “Photosynthetic Photon Flux Density.” It tells you how much usable light (in μmol/m²/s) is actually reaching your plants' leaves — which is what really matters for growth.
Q: What does μmol/s mean?
A: It’s a way to measure total light output (called PPF). Check your light’s packaging or specs for this number — it usually ranges between 200–2000 depending on the fixture.
Q: What’s a good PPFD number?
A: Seedlings need 100–300, vegetative plants like 300–600, and flowering cannabis thrives between 600–1000+ μmol/m²/s.
Q: How can I raise my PPFD?
A: Lower your light closer to the canopy (if heat allows), upgrade to a higher-output fixture, or add reflectivity (like Mylar) to your walls.
Q: What if my PPFD is too high?
A: Raise or dim your light and watch for signs of stress like leaf curling or bleaching. More light isn’t always better!
Tool by GrōHaus — helping growers dial in their light, space, and yield.