mysticepipedon
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Great point brother…. Definitely something to verify@Weedgrower — you didn't mention temperatures.
I don't know if this will have any bearing on your situation, but your plants may miss the heat from the HIDs. Dropping from 80F to 70F, for example, will cut biological activity roughly in half.
The problem is I can only go up in increments of 25%. Do they look ready to flip to you, how's the stretch during flower under led is it more or less?Increase light by the % change in duration. So say 18/6 to 12/12 would be a 33% increase. We are looking to maintain the same DLI (daily light integral) so if your at 600ppfd you would increase to 900ppfd.
But with that said you need to take into account the photosynthetic rates at which the plants can convert photons to energy. So you want to increase say 15% or so and over the next week or 2 up to the full 33% while paying attention to the plants.
Remember a slight V is desirable but not so much as to induce too much stress. After 1 grow paying attention you should have it nailed
Temperatures are pretty much 25c all the time. I have an electric fan heater with a thermostat and my intake is on a climate controller.@Weedgrower — you didn't mention temperatures.
I don't know if this will have any bearing on your situation, but your plants may miss the heat from the HIDs. Dropping from 80F to 70F, for example, will cut biological activity roughly in half.
Temperatures are pretty much 25c all the time. I have an electric fan heater with a thermostat and my intake is on a climate controller.
Use the height for even light soread and intensity. I have a few grs of work to do but ill get back at this thenThe problem is I can only go up in increments of 25%. Do they look ready to flip to you, how's the stretch during flower under led is it more or less?
What temperature should it be?That's really low for LED. Your leaf surface temps are probably horrid.
Leaf temps need 80-85f, I’ve been toldThat's really low for LED. Your leaf surface temps are probably horrid.
25c is 77f. So 26-27?
Nope thats room temps under LED with all things optimal. Leaf temps are what you really want to go byLeaf temps need 80-85f, I’ve been told
I use a 1000 watt true draw led and my results are fantastic. I would never use HID lights again. 10 white widow plants in week 1. Pic 2 is one Goldleaf plant 300 grams wet weight . I can easily get 20 oz in a grow in my 4 x 4 probably more if I did more training but I prefer big colas over SOG or SCROG .Not sure about the issue 1k watt led seems like not enough to me I’m at 3k w which is supposedly equal to 2x 600w HPS over 4’x4’ of grow space using LED (about 500 true watts)
What are the true watts of the light pulling from the wall?
Either way your plants look healthy as hell!
Get the other stuff sorted first though because the changes in transpiration also change the evaporative cooling from the leaves. So dial in the light then the leaf temp’s25c is 77f. So 26-27?
Beautiful... with HPS I have been getting 25 to 30 Oz in my 1.5 X 1.5. I'm hoping to get a tad more under my led :)I use a 1000 watt true draw led and my results are fantastic. I would never use HID lights again. 10 white widow plants in week 1. Pic 2 is one Goldleaf plant 300 grams wet weight . I can easily get 20 oz in a grow in my 4 x 4 probably more if I did more training but I prefer big colas over SOG or SCROG .
Beautiful... with HPS I have been getting 25 to 30 Oz in my 1.5 X 1.5. I'm hoping to get a tad more under my led :)
You got it and thats covered here..
Next up... dialing in your VPD to pull it all together...
So in regards to this. Use a combination of height and power input to control the intensity and even coverage of light to the plants. You can do this any way you like the most ideal and wasteful would be to hang the light as high as possible while reaching optimal ppfd and run it at 100% it would give the most even light spread but also consume the most power.Use the height for even light soread and intensity. I have a few grs of work to do but ill get back at this then
Thats really high, i suppose you supplement co2? Because if i go any higher than 28 ambient with lights on i get very larfy buds. I’m not very experienced though been growing for 3yrs now. So could be due to other issues that i was unaware of. But high temps in my tent was the reason i switched from CMH to LED. Since i started growing with the 600w zeus i have ambient 26c, leaf temp 24-25c and at night its 20cPersonally, I've found my plants respond the best in the 28-32c range. Remember as @Aqua Man said that your leaf surface temps are typically 4-5 degrees under your room temperatures. So if your room is at 25/26c your leaf temps are very low. LED does not put out as much radiant heat as HPS which is great for keeping rooms cool but also has the adverse affect of running too cold.
Ideally you also want your night time temps to be about 10 degrees difference between your day time temps. Ex: 30c day 20c night
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