How Much PAR Do Cannabis Plants Need? – Understanding PPFD & PAR



Today I go over PPFD and PAR value so that you indoor Cannabis growers can read those LED grow light charts more easily.

41 Comments

  1. thanks for watching everybody! I published this on YT just cause it's such an important episode. See all the content you've missed the last few weeks on my Off-YT platforms! Linked to in the video description!

  2. I acquired some seeds and 6 out of 18 sprouted in my germination chamber. now i'm scared that i don't know the genetics or even strain/gender yet so here's hopin… just one hot mama is all i need. I'm wondering, what should i do with my light ratios with an unknown plant? just 12/12 for a given general period then all light? thanks for any responses. i'm very new to this and it's my medicine for a lot of things now!

  3. For me these numbers(everywhere shows same numbers) about ppfd for each stage dont work.I ve par meter and every time i try catch these numbers my plants stress.Do i do something else worng or its marketing?

  4. My issue is my led lights at 15% dim is already at 550 par am in veg I try putting it to 25% amd it goes to 1000 par it’s a 600 watts do I keep it at 15% meanwhile the manufacturer recommended 100% for veg ? Can u help me out

  5. I have a 3000 watt full spectrum LED light and I have little baby plants that are about the length of a middle finger how high should this 3000 light be from those plants without burning them or hurting them I actually have the light about 4 ft from them right now is that too high

  6. Heat stress is easy to spot but light stress is a completely different beast and much trickier to resolve, brighter isn't always better, took me a while to realize the difference.

  7. Pt.2…..if you want fast growth instead of those stunted plants yajl grow. Seedlings 140-175 ppfd first 7 days, 200-250 next 5 days and finish seedlings off at 275-300 ppfd (never ever 400). Vegetation 350-400 ppfd first 5 days and so on and so on.

  8. Pt.1…Why would anyone in they right mind ever put 400 ppfd over a damn seedling if u can out 400 under a plant in veg. Think about that. Do not put no damn 400 ppfd over no damn seedlings. Don't give that much light meant for a big plant to a baby, that's why yahl killing yahl plants so young from to much light.

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