Dr. Bruce Bugbee unmasks myths and answers Frequently asked questions on grow lights for cannabis based on his research study so far at Utah State University's Crop Physiology Lab (see time-stamps below to browse subjects) and the next video in the series here: Bruce is a world-renowned crop physiology professor well-known for his work in regulated environment farming for NASA and is president of Apogee Instruments, a designer of research-grade instruments utilized in accuracy farming. Bruce's laboratory at Utah State is one of the few with a license to study marijuana cultivation with numerous active research study jobs underway (see: ). The lab's license is to research hemp, however these concepts use to cannabis, including sativa and indica. Some of Bruce's answers in this video are based on what the research study is showing so far, however even more tests are underway. As this is a very hot topic today, we will do our finest to keep track of questions posted in the comments below and ask Bruce to address them in future videos.
Timestamps of subjects covered:
0:00 Introduction 2:24 Light as one of the 9 cardinal specifications 4:04 Can too much light cause problems with my marijuana plants?
5:30 How far should my lights be above my cannabis plants?
9:30 What is the optimum light strength for growing marijuana?
16:59 PAR and PPFD discussed 19:30 The best DLI (Daily Light Integral) for Marijuana 24:25 The proper tools to measure light levels 26:40 DLI levels for seedlings/cuttings 27:20 Picture durations and light pollution limits throughout dark periods 30:20 New light pollution sensors 31:30 Light requirements of various cultivars 32:50 Light quality impact on the synthesis of cannabinoids and terpenes 34:17 UV and Far-red results on marijuana 39:40 Optimum spectrum for veg and blooming 42:52 Design Light Consortium (DLC) and light efficiency listings Links: * Dr Bruce Bugbee's bio: * Apogee PPFD Handheld meter version -* USB Smart Sensing unit version -* All other models -Apogee PAR-FAR and Red – Far-red sensors: Apogee microCache Bluetooth micrologger: Design Light Consortium:
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