Cannabis Grow Lighting Myths and FAQs with Dr. Bruce Bugbee
Cannabis Grow Lighting Myths and FAQs with Dr. Bruce Bugbee
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: https://youtu.be/JwtkHxv_3pU . 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: https://www.usu.edu/today/?id=58336 ). 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
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APOGEE PPFD HANDHELD METER VERSION
https://www.apogeeinstruments.com/mq-500-full-spectrum-quantum-meter/
APOGEE USB SMART SENSOR VERSION
https://www.apogeeinstruments.com/sq-520-full-spectrum-smart-quantum-sensor-usb/
BUY AN APOGEE QUANTUM (PAR) SENSOR
https://www.apogeeinstruments.com/quantum/
BUY AN APOGEE PAR-FAR AND RED – FAR-RED SENSORS
https://www.apogeeinstruments.com/red-far-red-and-par-far-sensors/
BUY AN APOGEE µCACHE BLUETOOTH MICROLOGGER
https://www.apogeeinstruments.com/microcache-bluetooth-micro-logger/
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LEARN MORE ABOUT DR. BRUCE BUGBEE
https://en.wikipedia.org/wiki/Bruce_Bugbee
https://psc.usu.edu/directory/faculty/bugbee-bruce
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LINK
Design Light Consortium: https://www.designlights.org/
"Cannabis is a racecar that can go incredibly fast."
-greatest quote of all time
The guy’s a living legend. Always great videos.
soil ph and water ph are not a cardinal ?
So my brother is using dual 900w full spectrum grow lights with the veg and bloom switch on, his plants are alive, but growing slowly. Is it simply too much light?
He has 3 autoflower plants at about 14 days that are a node or 2 behind where they should be.
Should he just have 1 light on, at max height, with just the veg switch on?
Just planted my first 4 plants 🙏🙏🙏🙏
"Our eyes are one of the worst meters for plants"
This is the best video I’ve seen on this. No stoner BS just the info
Your videos are extremely educational thank you so much
The classes we didn’t get in university 🌿
1.25x speed is better too watch, Dr BB must do some sampling of his research, a true professional
I didn’t know getting stoned had so much science behind
This was very informal and educational. Thank you
One growing sativas should actually run their lights on for 11 hours and off for 13 hours for the last three weeks of flower/
thank you thank you thank you thank you thank you
Just found your vid. You’re AWESOME!!!!
Thank you for the best video YouTube has to offer on this topic! Your students are lucky to have you as a professor!
Dr. Bugbee is my dream teacher
What is the umol/(m2*day) for a sunny day at say 45 latitude? The intensity changes throughout the day so when comparing DLI between and indoor and outdoor environment the light intensity changes throughout the outdoor environment with the position of the sun, but indoors it remains constant.
It’s simple. Cannabis will only grow as fast as the limiting factor
información de oro
I don’t know. He looks like a cop to me. Beware. Lol!
Smoke a joint and keep it on x1 thank me later
what led can i use to replace a 250W hps for cannabis flowering room of 24 sq ft. = 1,5 m x 1,5 m ? if possible under 1000 euros.
YT censorship test 1
This was a very good instructional video. Many thanks sir.
I’m very curious. As cannabis flowers, its metabolism changes from what it was when the plant was in its vegetative stage. Does the DLI, which the plant can utilise, change as well? Or can it handle a full bright summers day worth of DLI in a stage where it ‘thinks’ its experiencing the end of autumn?
From what you say, it sounds like the latter might be the case?
I love this guy, watching him has brought my herb to the next level. Get a micromol meter, it will payoff. Reagent grade darkness is very important as well.
good talk sir
I have the same light that you have in the white frame. And it is a fantastic light
Dr long live u beauty
Am I running too low. In early veg I run 450 ppfd at canopy level. My hours = 20 per day. By math I believe it comes to around 33 DLI . These are indoor autos.
So why is it that when you push your plants indoors to 2000umols you need c02 but outdoor you dont need it?
Well I learned a lot and am going to rewatch it a couple times! Annnd kinda feel like buying some sweet godly Apogee sensor thingies.
Hydro Farm Radiant 8 is the way to go. By all parameters it is the closest thing to sunlight light . Either vented or unvented models are available. LED lighting has very limited light spectrum, and plants are very sensitive to color of light and a very little interference can be critical , while HPS lighting provides full spectrum and 2 x 2 ft light reflectors of Radiant 8 cover area of 4 by 4 ft ( or even more) of growth area. You can chose 4 position ballast or even dimmable ballast that is perfect for growing seriously.
My autoflowers grow significantly when the lights are off
would 1400 mmol be okay for 6 plants?
I forgot I put him on 1.25x speed and was only listening until he said he was showing the meters, and then he was moving so fast it made me think he was tweaking for a second!lol
Did anyone teach you if cannabis uses infertility formulas? Am I right science? Huh huh?
Sales pitch
Solid for the knowledge 💯 watching from New Zealand 🇳🇿 gathering all the knowledge untill my country decides 😑 to legalize Skunky frosty herbal Marijuana 😅😅
super
Excellent information and clearly explained. Great content. Perhaps get a different interactive whiteboard though, as you cannot write on it effectively. 🙂
Hey, that was great info! I learned lot!
free college!!! go aggies!!
Adjusting the light height comes from non LED lights because they could not be dimmed easily. I fix my LED light at maximum in my tent and adjust PAR required during grow. I know it is not the most efficient $ wise (+/- 100 watts = $4 to $5 a month) but 1 less worry. So therefore we should spec the light wattage (or PAR value) according to tent height. The plant will grow closer and closer to the light anyway.
why not just grow in the back yard?
Thank you sir. That was educational.
Put the video on 2x. Your welcome 🙏 ☺
Thanks for a great video. I grow auto flower plants. I’m running 20/4 start to finish.
And how many BTUs of cooling is required for not even 60, but 43 mols per square meter per day?
Bruce said the young cuttings can be pushed with high light what about new seeds just starting out?