DLI Chart

Cannabis grow room tool

DLI Recommendations by Plant Age

Daily Light Integral targets from seedling through maturing. Use these as a planning baseline for normal growth without added CO2.

45peak mol/m²/day

Recommended DLI by week

Recommended DLI Light cycle

DLI formula: DLI = PPFD × photoperiod (hours) × 3600 / 1,000,000. For example, 600 µmol/m²/s for 18 h is 600 × 18 × 3.6 / 1000 = 38.9 mol/m²/day.

DLI Calculators

Convert between canopy PPFD, photoperiod, and daily light integral.

PPFD → DLI

Use a meter reading and light schedule to estimate the daily total.

mol/m²/day

DLI → PPFD

Use a daily target and photoperiod to find the average canopy PPFD.

µmol/m²/s
This is the average canopy PPFD needed across the whole lit period.