Daily Light Integral (DLI) Calculator

Calculate Daily Light Integral for plants, optimal light levels, and grow light requirements.

Light Measurements

μmol/m²/s

Photosynthetic Photon Flux Density

hours
inches

Or Calculate Required PPFD

mol/m²/day

Results

Enter light measurements to calculate DLI

DLI Guidelines

Plant DLI Requirements

  • • Low light: 10-15 mol/m²/day
  • • Medium light: 15-25 mol/m²/day
  • • High light: 25-40 mol/m²/day
  • • Very high light: 40+ mol/m²/day

DLI Formula

  • • DLI = PPFD × Hours × 0.0036
  • • PPFD = Photosynthetic Photon Flux Density
  • • 0.0036 = Conversion factor
  • • Units: mol/m²/day