 The equation for converting PPFD to DLI, assuming constant PPFD, is below.DLI (mol m-2d-1) =0.0036 * PPFD (μmol m-2s-1) *Hours of Light 
The light quantity requirements for crops vary, in general the light requirement for a specific crop is greater for crops that are fruiting and flowering and is less for crops that remain vegetative.Leafy greens such as lettuce, spinach, and kale are typically considered low-light crops, requiring a DLI between 12 and 17 mol m−2d−1.Tomatoes, cucumbers, and peppers require between 20-30 mol m−2d−1.