Dr. Bruce Bugbee debunks myths and answers FAQs on grow lights for cannabis based on his research so far at Utah State University's Crop Physiology Lab (see time-stamps below to navigate topics) and the next video in the series here: . Bruce is a world-renowned crop physiology professor famous for his work in controlled environment agriculture for NASA and is president of Apogee Instruments, a developer of research-grade instruments used in precision agriculture. Bruce's lab at Utah State is one of the few with a license to study cannabis cultivation with several active research projects underway (see: ). The lab's license is to research hemp, but these principles apply to marijuana, including sativa and indica. Some of Bruce's answers in this video are based on what the research is showing so far, but further tests are underway. As this is a very hot topic right now, we will do our best to monitor questions posted in the comments below and ask Bruce to answer them in future videos. VIDEO CONTENT 0:00 Intro 2:24 Light as one of the nine cardinal parameters 4:04 Can too much light cause problems with my cannabis plants? 5:30 How far should my lights be above my cannabis plants? 9:30 What is the optimum light intensity for growing cannabis? 16:59 PAR and PPFD explained 19:30 The best DLI (Daily Light Integral) for Cannabis 24:25 The proper tools to measure light levels 26:40 DLI levels for seedlings/cuttings 27:20 Photo periods and light pollution thresholds during dark periods 30:20 New light pollution sensors 31:30 Light requirements of different cultivars 32:50 Light quality effect on the synthesis of cannabinoids and terpenes 34:17 UV and Far-red effects on cannabis 39:40 Optimal spectrum for veg and flowering 42:52 Design Light Consortium (DLC) and light efficiency listings ------ Follow us to see all the cool places our sensors are used, get notices for free classes and how to videos, and product announcements! -Blog -Facebook -Twitter -LinkedIn -Instagram ------ APOGEE PPFD HANDHELD METER VERSION APOGEE USB SMART SENSOR VERSION BUY AN APOGEE QUANTUM (PAR) SENSOR BUY AN APOGEE PAR-FAR AND RED - FAR-RED SENSORS BUY AN APOGEE µCACHE BLUETOOTH MICROLOGGER ------ LEARN MORE ABOUT DR. 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Aired: May 11, 2025
