Understanding Your Lights

Trial Before Error
Matthew J. Grassi, Greenhouse Management, 2020. “Testing different lighting setups in your greenhouse has its advantages, but there are also some factors to be aware of in order to ensure accurate data collection and observations.”

Making Sense of Light Sensors
Roberto G. Lopez and Erik S. Runkle, Greenhouse Production News, 2021. “Learning to convert radiation data from your environmental computer into daily light integral.”

Measuring DLI in a Greenhouse
Ariana P. Torres and Roberto G. Lopez, Purdue Extension Fact Sheet. “This publication examines the characteristics of green-house lighting and describes how the daily light integral (DLI) can be used in greenhouse production.” Table 2 provides DLI requirements for various greenhouse crops.

Lighting Units Conversion Calculator
Environmental Growth Chambers using data from the Plant Growth Chamber Handbook. 1997
Use this calculator to convert between different lighting units and lamp types, using data from the

To LED or Not to LED
Erik Runkle, American Floral Endowment. 2019. An outline of a five-part series of articles on LED lighting impacts on plant growth and the economics of LED lighting when growing plants indoors. The series was written with colleagues for GrowerTalks magazine.

Embracing a New Understanding of PAR
Jolene Hansen, Greenhouse Management. 2019. “Research at Utah State University is transforming our understanding of photosynthesis and light”.

Q&A: Making Way for the Sun
Marc van Iersel, Greenhouse Management. 2019. Interview by Patrick William on light dimming research.

DLI ‘Requirements’
Erik Runkle, Greenhouse Production News-technically speaking. 2019. This article outlines the factors that play into determining DLI requirements.

A Little Far-Red Light Goes a Long Way
Mengzi Zhang, Yujin Park, and Erik Runkle, Grower Talks. 2019. This article weighs the pros and cons of using far-red light.

LEDs: Blue & Far-Red Light
Yujin Park, Erik Runkle, Grower Talks. 2019. “How do blue and far-red light affect the quality of ornamental seedlings?”

Growing Ornamental Seedlings Under White LEDs
Yujin Park and Erik Runkle, Greenhouse Grower. 2018.

Indoor Grow Rooms Can Improve the Success of Young Plant Propagation.
David Kuack, Greenhouse Production News. 2019. “Indoor grow rooms equipped with LEDs can produce consistent young transplants, making it easier for growers to plan their planting schedules and delivery orders.”

Horticulture’s History with Disruptive Technology: LED Lighting Takes Its Turn.
Peter Konjoian and Alex Bodell, Greenhouse Production News-duets. 2019. A conversation about the role of LED lighting in horticulture.

Selecting an LED Fixture
Erik Runkle, Greenhouse Production News-technically speaking. 2019. Runkle outlines considerations for choosing LED fixtures.

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