Featured Contributors |
AUS / NZ EDITION • VOL . 20 NO . 6 November / December 2022 |
IA |
Ian Ashdown is a research engineer who brings 40 years experience in lighting design , research and development , as well as software engineering . He owns and runs Sun Tracker Technologies and Byheart Consulting . |
EH |
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Eric Hopper has more than 10 years of experience in the hydroponic industry as both a retail store manager and owner . He continuously seeks new methods and products that could help maximise garden performance . Eric resides in Michigan where he and his family strive for a self-sufficient and sustainable lifestyle . |
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Contributors
+ Lee Allen Marc Descoteaux Rich Hamilton Philip McIntosh Lynette Morgan Alan Ray
A DAILY LIGHT INTEGRAL ( DLI )
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Daily light integral ( DLI ) is the measurement of photosynthetically active radiation ( PAR ) received by a square metre of a given surface area ( the plant canopy ) within a 24-hour period . DLI is expressed as moles of light per square metre per day ( mol · m −2 · d −1 ). DLI measurement is key to understanding the relationship between PAR and a plant ’ s growth , development , yield , and quality .
DLI is a simple metric to calculate while cultivating indoors , since light intensity and photoperiod will stay constant in each stage of cultivation . However , DLI becomes mor complicated to accurately calculate when cultivating outdoors or in a greenhouse because of the atmospheric and seasonal lighting changes which occur throughout any 24-hour period .
DLI relates directly to photosynthetic photon flux density ( PPFD ) which is the number of photons measured in the PAR range , received in a square metre of canopy per second . However , PPFD does not take into account the length of the day light period and the possible changes in light intensity over the day . DLI more completely describes a given plant ’ s holistic environmental lighting conditions .
Check out Ian Ashdown and Marc Descoteaux ' s article on page 30 for more information .
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