Daily Light Integral Meter

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.

Daily light integral meter.

Full credit and many thanks to both of these scientists 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 the formula for calculating dli is. With a push of a button the daylight indictor records light intensity for a 24 hour period and then. μmol m 2s 1 or ppfd x 3600 x photoperiod. Daily light integral dli is the total number of photosynthetically active radiation par photons traditionally those between 400 700 nm incident on an area over the course of a day dli is a function of both the intensity and duration of the photosynthetic light falling on the target over a day and is most commonly expressed as moles of light per square meter per day or mol m 2 d 1.

Daily light integral dli refers to the accumulated light over a 24 hour period in moles per square meter per day of par. 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. Typical dli levels are 5 to 8 moles 2 day for propagation and above 10 moles m 2 day for flowering and fruiting. 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.

This pocket sized water resistant unit will compare light level intensities within or outside your greenhouse or desired location. 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. Simply place it on the area to be tested and 24 hours later it will display your daily light integral dli. It is expressed in terms of moles of light per square meter per day or mol m 2 d 1.

It s not possible to use a constant multiplier with variable lighting so a quantum meter that has an integrating capability is necessary to determine the daily light integral under variable lighting. 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. Daily light integral dli dli ppfd over the course of a light cycle measured as moles of par photons per day example. The apogee mq series meter is designed to measure and store this value each day.

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