DLI Calculator

Light is a plant’s food. It is imperative that cultivator’s monitor the amount and type of food their plants receive, just as a nutritionist must monitor what an athlete eats. Each day there is a minimum amount of sunlight a plant must receive to meet their basic biological needs. The most common metric for this is Daily Light Integral (DLI), which measures the cumulative amount of PAR light energy that a surface receives over the course of a day. This metric gives cultivators insight into how much light is available for their plants, expressed as a Moles per Day value.


Two values are required to calculate the third one

Average DLI Distribution (United States)

Northern Region: Washington, Oregon, Idaho, Montana, Wyoming, North Dakota, South Dakota, Minnesota, Iowa, Wisconsin, Illinois, Michigan, Indiana, Ohio, Michigan, Pennsylvania, New York, Vermont, New Hampshire, Maine, Rhode Island, Connecticut, New Jersey, Delaware, Massachusetts, Maryland

Central Region: **Northern California, **Northern Nevada, Utah, Colorado, Nebraska, Kansas, Oklahoma, Missouri, Arkansas, Tennessee, Kentucky, West Virginia, Virginia, North Carolina

Southern Region: **Southern California, **Southern Nevada, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama,Georgia, South Carolina, Florida

These figures are Average DLI for the entire region. Different geographical and environmental variables may be at play when consulting on lighting for clients. Use map and table above as a general reference to the area that the client will be operating in. These measurements are based off of direct outdoor sunlight. It will be important to get readings including interior greenhouse glazing, and possible structural interference as the sunlight moves throughout the day. Also note it will be important to track the sunrise and sunset times of the area as well to ensure proper direct DLI and supplemental DLI levels match up.

Values in light pink represent typical target DLI amounts

500 uMole represents a typical desirable light intensity for indoor early stage growth.

1000 uMole is a high level intensity for both indoor and greenhouse supplemental lighting for late stage and flowering growth.

1500 uMole is a typical plant saturation level for high DLI crops.

2000 uMole is a typical maximum natural sun output on a clear day.

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