Question 1

What is the difference between PPFD and DLI?

Accepted Answer

PPFD measures light intensity landing on a spot per second (µmol/m²/s). DLI (Daily Light Integral) measures the total light energy delivered to that spot over a 24-hour day (mol/m²/d).

Question 2

What is an optimal DLI range for flowering cannabis?

Accepted Answer

Flowering plants thrive under 35 to 45 DLI. Higher intensity up to 55 DLI can be used if ambient CO2 is supplemented, preventing light stress or bleaching.