Controlling Supplemental Lighting Based on Photosynthesis Efficiency
-Suyun Nam
-3 min 52 sec
Suyun Nam, van Iersel Lab Graduate Research Assistant at the University of Georgia, provides a description on controlling supplemental lighting based on photosynthetic efficiency.
LAMP Biofeedback System
–Mark Haidekker
-15 min 41 sec
Mark Haidekker, Professor of Engineering at the University of Georgia, discussed an actinic light biofeedback system. The goal of this system is to regulate actinic light to established a fixed electron transport rate (ETR).
Supplemental vs Photoperiodic Lighting
-Anthony Percival
-5 min 15 sec
Anthony Percival, a PhD student in Dr. Josh Craver’s lab at Colorado State University, discusses two common categories of lighting in greenhouses. Supplemental lighting versus photoperiodic lighting.
CO2 Enrichment for Production in Controlled Environments
-Josh Craver
-4 min 59 sec
Josh Craver, Assistant Professor at Colorado State University, discussed the basics of CO2 enrichment in controlled environments.
LAMP Lighting Cost Calculators, A Brief Introduction
-Marc van Iersel
-6 min 52 sec
In this video, Marc van Iersel, University of Georgia Professor, provides a brief introduction into the 3 lighting cost calculators for greenhouses as developed by Project LAMP.
Understanding Electricity Cost vs Demand Charge,
-Marc van Iersel
-5 min 20 sec
Marc van Iersel describes the difference between the electricity cost and the demand cost in the electricity bill that you receive every month.
Lighting approaches to maximize profits.
-70 minutes
“Supplemental lighting is often necessary for year-round greenhouse production of ornamentals and vegetables. However, the cost of providing supplemental light is high. It is therefore important that supplemental light is provided in a way that provides the greatest benefits for the crop, at the lowest possible price. To do so, it is important to understand the cost of providing supplemental light as well as how plants use that light. Accurate weather predictions can help minimize the risk of providing more excess light than is required by a specific crop. Learn how to account for these factors to help grow high-quality, profitable crops.” Dr. Marc van Iersel, April 2020
Turning Photons into Food.
-32 minutes
“In this video, Dr. Bruce Bugbee shows the calculations necessary to determine crop yield potential when light is the only limiting factor. This is now widely used to predict yields in indoor agriculture and vertical farming. The approach starts from the efficiency of photosynthesis (measured as quantum yield), expands to include the efficiency of respiration (called carbon use efficiency) and includes photon capture efficiency and harvest index. The model is called the Energy Cascade Model. It has been used by NASA to model the size of a space farm in regenerative food production. It is also used by the USDA to calculate potential yield of agriculture on Earth.” Dr. Bruce Bugbee, October 2019
Toward an Optimal Spectral Quality for Plant Growth and Development.
-23 minutes
“In this video, Dr. Bruce Bugbee summarizes the dual effects of photon quality on photosynthesis and plant shape. Spectral quality has an enormous effect on shape, but the effect varies among species. Conversely, the effect of spectral quality on photosynthesis is nearly constant among species, but our definition of photosynthetic photons may need revision to include both far-red photons and UV photons between 360 and 400 nm.” Dr. Bruce Bugbee, October 2019
Far-red: The Forgotten Photons.
-28 minutes
“In this video, Dr. Bruce Bugbee reviews recent research on the powerful effect of far-red photons on plant growth and development. The summary includes the evidence for the direct value of far-red photons in photosynthesis as well as their value in promoting leaf expansion rate in lettuce. The evidence indicates that we need to redefine photosynthetic photons to include wavelengths beyond 700 nm. The availability of efficient far-red emitting LEDs means that there are immediate commercial applications of this research for indoor agriculture.” Dr. Bruce Bugbee, October 2019
Predicting Stem Elongation and Leaf Expansion: Percent far-red is a better predictor than PPE.
-20 minutes
“In this video Dr. Bruce Bugbee explains why the measurement of percent far-red photons can be a better predictor of stem elongation and leaf expansion than the phytochrome photo-equilibrium (PPE). Measuring and controlling this is critical in crops grown under electric grow lights like leafy greens and cannabis.” Dr. Bruce Bugbee, November 2019