Daily Light Integral

This metric is important to measure since the amount of light your plants get in a day.

Daily light integral.

Daily light integral dli describes the number of photosynthetically active photons individual particles of light in the 400 700 nm range that are delivered to a specific area 1m2 over a 24 hour period. μmol m 2s 1 or ppfd x 3600 x photoperiod 1 000 000 dli or moles m2 day. It is expressed in terms of moles of light per square meter per day or mol m 2 d 1. Daily light integral dli is a measure of the aggregate amount of par light that a surface receives over the course of a day.

The term daily light integral refers to the number of light particles or photons received during one day in a particular location and area. An area s daily light integral is the number of light particles that are received in one full day. It is a very useful metric to determine if a particular location receives sufficient amounts of light for plants to grow well. Daily light integral dli dli ppfd over the course of a light cycle measured as moles of par photons per day example.

It is expressed as moles of light mol per square meter m 2 per day. μmol m 2 s 1 and duration day. Calculating dli can help you select which crops to grow knowing what will grow best in your region based on the amount of light it will receive. Daily light integral dli maps display the ambient light delivered daily during each month across the entire u s.

Daily light integral in simple terms is the amount of photosynthetically active radiation par or plant available light that falls on a location in a 24 hour period. They are unique because dli is a measurement of light that is particularly valuable for estimating plant. The daily light integral dli is the number of photosynthetically active photons photons in the par range accumulated in a square meter over the course of a day. The formula for calculating dli is.

Ho 238 w measuring daily light integral in a greenhouse purdue extension 2 daily light integral daily light integral dli is the amount of par received each day as a function of light intensity instantaneous light. A light emitting ppfd 1000 running 12 hours emits a dli 43 2 moles day computed as 60 sec min 60 min hr 12 hrs day ppfd 1 million current research indicates cannabis grows best at ppfd 1500 dli 65 and temperature 30 degrees c lighting. Dli is an important variable to consider particularly when growing plants in a greenhouse. Daily light integral referred to as dli is the amount of photosynthetically active radiation par received each day as a function of light intensity and duration.

These maps were researched and developed by james faust of clemson university and joanne logan of the university of tennessee. It is a function of photosynthetic light intensity and duration day length and is usually expressed as moles of light mol photons per square meter m 2 per day d 1 or.