Typical PPFD and DLI values for crops

The summary tables of the DLI requirements of greenhouse and indoor crops. From vegetables, to flowers, to ornamental plants.

An important parameter is the Daily Light Integral which is defined as the total number of photons incident per square meter in a day.

DLI is measured in units of mol / m² and each plant has a specific requirement of DLI for its growth. Values between 6-18 mol / m² / day are the most commoni, but may vary depending on the particular plant.

There is a relationship between PPFD and DLI which is given by: DLI = PPFD x hours of light per day x (3600 / 1000.000).

You can see from this formula that there is a correlation between PPFD and the number of hours of light required to reach a certain DLI value.

Let's take a look at the DLI of some crops that are commonly grown in greenhouses.

  • Vegetative growth (leafy vegetables / herbs): Minimum 17 mol / m² / d
  • Flowering crops (peppers / tomatoes): 20-40 mol / m² / d

Let's take a look at the DLI of some crops that are commonly grown indoors.

  • Microgreens (young plants): 6-12 mol / m² / d
  • Vegetative growth (leafy vegetables / herbs): 12-17 mol / m² / d
  • Flowering crops (peppers / tomatoes): 15-40 mol / m² / d
Minimum ○Good ◎High ●Average of Daily Light Intergral (Moles / Day)
Species24681012141618202224262830
Ferns (Pteris Adiantum)          
Maranta          
Phalaenopsis (Orchid)          
Saintpaulia          
Spathiphyllum          
Forced Hyacinth
Forced Narcissus
Forced Tulip 
Aglaonema         
Bromeliads         
Caladium 
Dracaena         
Nephrolepsis         
Streptocarpus         
Hosta 
Hedera (English Ivy) 
Begonia        
Sinningia        
Schlumbergera 
Cyclamen       
Exacum       
Heuchera       
Coleus (Shade)     
Impatiens, New Guinea     
Iris, Dutch (Cut Flowers)     
Kalanchoe     
Lobelia 
Primrose     
Impatiens    
Pelargonium Peltatum (Ivy Geranium)   
Begonia (Fibrous) 
Senecia (Dusty Miller) 
Fuchsia  
Euphorbia (Poinsettia)  
Lilium (Asiatic and Oriental)  
Lilium Longiflorum (Easter Lily)  
Antirrhinum  
Chrysanthemum (Potted)  
Dianthus  
Gazania  
Gerbera  
Hibiscus Rosa-Siniensis  
Lobularia  
Pelargonium Hororum (Zonal Gera -reste)  
Rose (Miniature Potted)  
Salvia Splendens  
Schefflera  
Angelonia   
Aster   
Sage Farinacea   
Iberis   
Catharanthus (Vinca)   
Celosia   
Chrysanthemum (Garden)   
Dahlia   
Echinacea   
Ficus Bejaminia   
Gaura   
Hemerocallis   
Lantana   
Lavendula (Lavender)   
Tagetes (Marigold)   
Petunia   
Phlox (Creeping)   
Rudbeckia   
Sedum   
Thymus   
Verbena   
Viola (Pansy)   
Zinnia    
Alstroemeria (Cut Flower)    
Capsicum (Pepper)    
Chrysanthemum (Cut Flower)    
Dianthus (Carnation)    
Gladiolus (Cut Flower)    
Lycopersicon (Tomato)    
Rose (Cut Flower)    

Typical values of μmol / s.m² for irradiation in horticulture

Light level by type of crop
PlantMin (μmol / s.m²)Max (μmol / s.m²)Typical (μmol / s.m²)
Tomato170350270
Sweet pepper120300230
Cucumber120350230
Vegetative growth280550350
Floriculture6501,5001,000
PlantDLI
Lettuce14 – 16
Peas9
Basil12
Broccoli15 – 35
Tomatoes20 – 30
Zucchini25
Peppers30 – 40
Cannabis30 – 45
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Calculate the DLI (Daily light integral) of the greenhouse you have in mind. Starting from the Italian geographical area concerned and knowing the limiting factors, in terms of the reduction of light radiation determined by the structure and material chosen as roofing, you can calculate the DLI of your project.

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