One of the go-to lighting metrics of greenhouses is DLI, or Daily Light Integral, and you may see this acronym when you’re trying to figure out how much light a specific type of plant needs. Put simply, DLI is a measurement of how much usable light hits a certain area (one square meter, to be exact) per day.

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How is DLI Measured for LEDs?

DLI is measured in moles of light in the PAR (Photosynthetically Active Radiation) range per square meter per day. For a quick brush-up on the best way to measure plant lighting, check out this post. If you want to figure out what your lighting system’s DLI is, the best place to start is to determine what your PPFD is at plant canopy height. PPFD refers to Photosynthetic Photon Flux Density and refers to the number of photosynthetically active photons that hit a square meter of area per second. The units for PPFD are micromoles per meter squared per second (written as μmol m-2 s-1).

To measure your PPFD, your best bet is a quantum sensor like an Apogee SQ-500 or MQ-500, or a Li-Cor 190R, however you can also get a close estimate by simply entering values into a PPFD calculator like this one: (note – this links to the rollitup forum which focuses only on growing weed, and is NSFW. Link ishere, link to download is on post #243). It’s worth noting that you can also get an estimate of DLI by measuring your light source with a lux or foot-candle meter and applying a conversion factor to get PPFD, though these conversion factors are typically only available for metal-halide or halogen lamps, and not LED lighting.

How to Calculate DLI

Once you have your PPFD, you can calculate your DLI:

  1. PPFD measures micromoles per second, so take your PPFD and multiply it by 60 to get micromoles per minute
  2. Multiply your figure above by 60 again to get micromoles per hour (you can combine steps 1 and 2 by multiplying your PPFD by 3,600)
  3. Multiply the above figure by the number of hours your lights will be on to get micromoles per “day” (photoperiod)
  4. Divide the above figure by 10^6 to convert it from micromoles per day to moles per day (using a calculator, enter 10, then press the xy button, then enter 6)

This will be your DLI.

For example, let’s say we have a PPFD of 400μmol m-2 s-1 and we leave our lights on 14 hours a day.

  1. 400 * 60 = 24,000
  2. 24,000 * 60 = 1,440,000
  3. 1,440,000 * 14 = 20,160,000
  4. 20,160,000 / 10^6 = 20.16

DLI = 20.16

If you’re lazy, I’ve got you covered. Just use this little calculator:

How to Use DLI to Calculate Required PPFD

You can also work backwards and figure out how high your PPFD would need to be, in order to hit a certain DLI:

  1. Multiply DLI by 10^6 to convert to micromoles
  2. Divide this figure by the number of hours per day your lights are on
  3. Divide this figure by 60 to convert to minutes
  4. Divide again by 60 to convert to seconds

For example, let’s say you do some research and discover that your tomatoes require a DLI of 22 moles per day. If we only want to run our lights for 12 hours a day, what will our PPFD need to be at canopy level?

Using the steps above:

  1. 22 * 10^6 = 22,000,000
  2. 22,000,000 / 12 = 1,833,333
  3. 1,833,333 / 60 = 30,556
  4. 30,556 / 60 = 509

PPFD = 509μmol m-2 s-1

And the calculator for this:

What Are Typical Natural Outdoor DLI Values?

DLI varies depending on time of year and geographical location. Below is a map of the United States showing the different DLI values throughout the year:

Different Plants Require Different DLIs

From plant to plant, there’s quite a difference in how much light is required per day. For example, lettuce may only require a minimum DLI of 15, while peppers and tomatoes require 22+. For a look at the needs of some different plants, check out this document on Measuring Daily Light Integral in a Greenhouse, created by the Purdue Department of Horticulture and Landscape Architecture.

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Executive Order 20-99

The Executive Order issued by Gov. Walz on Nov.18, 2020, does not impact DLI’s license exams. Exams will continue to be administered at our St. Paul office and in Duluth and New Ulm until further notice.

St. Paul exams

Exams at DLI's St. Paul office are offered on Tuesdays, Wednesdays and Thursdays except for weeks in which a state holiday falls, though not all exams are offered each day. No exams will be offered the weeks of and Jan. 18 and Feb. 15, 2021. View exam parking map. It is OK to park in the DLI employee lot during your exams.

New Ulm exams

  • New Ulm Conference Center on Feb. 10, 11 and 12, and March 17, 18 and 19, 2021.

Duluth exams

  • The Inn on Lake Superior in Duluth on Feb. 24, 25 and 26, and March 29, 30 and 31, 2021.

Please note that not all exam types are available each day. You can view the dates available for your exam type after you begin the online scheduling process described below.

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Please check back for updates.

Exam scheduling

If you have already received a notice from DLI that you have been approved to sit for an exam, you can schedule an exam online. You will need the application number provided in the approval notice you received and the last four digits of your Social Security Number.

If you need a copy of your application number, contact us at [email protected] with your full name and the specific exam you applied to take. We'll respond with your application number as quickly as possible.

COVID-19 precautions and requirements

In order to be admitted to an exam site, examinees must bring with them a current government-issued identification card and a face mask.

To protect the health and safety of examinees and DLI staff, social distancing, hygiene and respiratory etiquette protocols will be enforced:

  • Examinees must maintain a distance of six feet from each other and from DLI staff at all times, including the check-in process prior to exam sessions.

  • Examinees are required to bring and wear face masks – examinees will not be admitted to the exam sites without a face mask.

  • Examinees must also undergo health screening at check-in (please review Tennessen Notice below).

  • Health screening consists of a series of questions relating to the examinee’s possible exposure to COVID-19 and current health status.

  • Examinees who refuse to undergo screening or respond positively to health screening questions will not be allowed to test and will need to reschedule at no additional cost.

  • All surfaces and exam materials will be sanitized following each exam session.

  • Hand sanitizer will be available, and examinees are encouraged to wash their hands before entering the exam sites and after leaving the exam rooms for any reason.

Questions and more information

  • Contact us at [email protected] You may also call 651-284-5031 and leave a message and we will return your call within one business day.

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Tennessen Notice

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Before you are admitted to take an exam, you will be asked to answer some questions about your current health status.

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DLI will use these questions to screen for potential health risks to try to avoid the potential of spreading COVID-19. The data collected from your answers is classified as private under the Minnesota Government Data Practices Act.

These questions are not a COVID-19 test and do not determine whether or not you are infected with or have been exposed to COVID-19.

In order to protect DLI staff and the public, agency staff, including non-medical personnel, will gather and review this data to determine whether to permit you to take the exam today based on whether risk factors are present.

You are not legally required to provide this data. However, if you refuse to provide the data, you will not be allowed to take the exam today.

The data collected from these questions may be shared with agency staff collecting the data, agency HR staff, the agency safety administrator, agency management, and other persons or entities as authorized by law.