Description
VPD at 70% Humidity 80° — Prepping Canopy for Under Canopy Lights
Questions this video answers:
— What is the ideal humidity and temperature fluctuation in veg?
— How do you prep a canopy for under canopy lights?
— Why does VPD matter more than just humidity alone?
— When do you add trellis mesh for multiple pulls?
— How do you use AI to identify problems in your grow room?
70% humidity. 80° temperature. 10% fluctuation. That's the sweet spot right now. 🌿🔴
Go over that 10-15% fluctuation and you're asking for trouble. VPD · DLI · light recipes — these three things running together is what separates good grows from great ones.
Under canopy lights sitting ready. One more week and a half until these plants hit the top and the real work begins — bottoms stripped · mesh going in · multiple pulls prepped.
**What we cover:**
— VPD explained — 70% humidity · 80° temp · 10% fluctuation rule
— Canopy prep for under canopy lights — what to do now
— Trellis mesh going in — multiple pull strategy
— Pre-trim prep — getting bottoms ready before flower
— Environmental stress — what got too cold and what we saw
— Gauges and controllers — what's running this room
— Greenway Grow Master AI identifying key issues in the garden
— Old gas strains running this room — what to expect
— Shorts series coming — weekly one minute progress updates
Drop SMART AI below and get my FREE book 👇
👇 FREE RESOURCES & LINKS 👇
📘 FREE — Smart AI in Cannabis → https://funnels.greenwayai.ca/smart-ai-in-cannabis-book
📘 FREE — LEDs The Keys to Your Growing Future → https://johnberfelo.com/leds-book-page
📘 From Pharma to Freedom → https://johnberfelo.com/pharma-to-freedom-book-page
💡 Grandmaster LEDs 10% OFF → https://grandmasterleds.ca/?ref=JOHNBERFELO Use code: JOHNBERFELO at checkout
🤖 Greenway Grow Master GPT → https://greenwayai.ca/ai-gpts
🌐 Greenway AI → https://greenwayai.ca
*Affiliate Disclosure: Some links are affiliate links. I earn a small commission at no extra cost to you.*
Subscribe — weekly updates + one minute shorts every week. 🌱
#VPD #Humidity #Temperature #CanopyPrep #UnderCanopyLights #GrandmasterLED #TrellisNet #MultiplePulls #LEDGrow #DLI #IndoorGrowing #GreenwayAI #MedTainer #GrowWithMe #GasStrains #CannabisGrowing #GrowSeason2026 #LightRecipe #AIGrowing #GrowTips
---
Why Your VPD Fluctuation Destroys Your Grow — The 10% Rule Explained — LED grow lighting setup and optimization for indoor cannabis.
In this video, I walk you through vpd, fluctuation, destroys, grow, rule and share what's actually working in 2026.
⏱ TIMESTAMPS
0:00 Intro
1:00 [section 1]
2:00 [section 2]
3:00 [section 3]
5:00 Wrap up
🛒 STORE
Store: https://medtainercanada.ca/
📚 SMART AI IN CANNABIS
Smart AI in Cannabis: https://www.amazon.com/author/johnberfelo
🌿 CONNECT
Greenway AI: https://greenwayai.ca
Website: https://johnberfelo.com/
Berfelo: https://berfelo.com/growth/education/
Instagram: https://www.instagram.com/john_berfelo_official_/
Subscribe: https://www.youtube.com/@JohnBerfelo
Facebook: https://www.facebook.com/john.h.berfelo.2025/
LinkedIn: https://www.linkedin.com/in/john-h-berfelo-7a410160/
#LEDgrowlights #indoorgrow #cannabislighting #growyourown #johnberfelo