USD
EUR
Home
Indoor
Octopus Series
Octopus-H Series Octopus-HL Series Octopus-G Series Octopus-XH Series
Moray Series
Greenhouse
Jellyfish Series
Shark Series
Shark-XR Series
Grow Racks
Find A Reseller
Contact Us
Blog
Currency:USD

What is Daily Light Integral (DLI)?

Views : 210
Update time : 2022-11-17 10:42:31
Daily light integral (DLI) refers to the number of photosynthetically active photons (individual particles of light in the 400-700 nm range) that are delivered to a specific area over a 24-hour period. In other words, it is the amount of light intensity the plant receives each day.

The equation for converting Photosynthetic Photon Flux Density (PPFD) to DLI, assuming constant PPFD, is below.

DLI (mol/m²/d) = PPFD*Light-hours/day* 3600s

  • Light-hours is the number of hours in a day active photons are delivered to the target area, measured in hours.
  • 3600s is one hour being converted to seconds.

For example, the PPFD that a plant needs is 600μmol/m²/s. If the plant can get a total 15 hours of lighting a day, then the DLI is 600μmol/m²/s*15h*3600s=32400000μmol/m²/d=32.40mol/m²/d.

If the plant needs a total 1000mol DLI throughout its growing stages and we give it 10mol each day, then it will get 100 days to harvest. But if we give it more mol, it will grow faster and can be harvested in a shorter time.

However, it is far more complicated due to the changeable weather and seasons. So, it is very essential to make reasonable supplemental lighting plans according to the species that you grow in different seasons.
 
Figure A is the DLI in December in the United States. It is 3mol per day on cloudy days and 9mol per day on sunny days. For most species, this DLI is not enough to reach their fastest growth, so it is necessary to use LED grow lights to fill up the gaps.

Figure B is the DLI of the US in June. The DLI is 12mol per day on cloudy days and that is enough. Of course, it is OK to provide supplementing light. On sunny days, it is 26mol per day, which is great for plants that prefer much light, but some plants that can't be placed directly under the light will need shading.
 
Above is the monthly DLI of the United States
Previous :
Next :
Related News
Read More >>
LED Growth Lights: Latest Technology and Trends LED Growth Lights: Latest Technology and Trends
Sep .21.2023
"Discover the latest trends in LED grow lights: intelligence, energy conservation, environmental protection, and personalized customization."
LED Growth Lights: A Scientific Revolution in Plant Growth LED Growth Lights: A Scientific Revolution in Plant Growth
Sep .20.2023
"LED Growth Lights: Revolutionizing Plant Growth with Scientific Precision" showcases successful case studies highlighting the transformative impact of LED growth lights on plant growth, indoors and outdoors.
Jellyfish VS HPS Jellyfish VS HPS
Sep .19.2023
Hortibest LED Jellyfish: Efficient, safe, and high-quality plant growth light for indoor cultivation. Ideal replacement for HPS lights. Enhanced spectrum, longer lifespan, lower heat, and versatile applications.
Usage and Maintenance of LED Growth Lights: Tips for Maximizing Lifespan and Illumination Efficiency Usage and Maintenance of LED Growth Lights: Tips for Maximizing Lifespan and Illumination Efficiency
Sep .14.2023
The article provides tips on using and maintaining LED growth lights to maximize their lifespan and ensure optimal lighting efficiency for plants. It covers placement, watering habits, timers, regular cleaning, inspection for leaks, and proper power supply.
Info