I agree but therein lies the question, which is more supieror the DE @ 750 or the SE @ 1000
DE killing plants at 5'
- Thread starter sgrowdum
- Start date
PSUAGRO.
Well-Known Member
No experience in 100% straight coco,sorry..............all I know is that a 1000w DE in a 5x3 is a lot of light(photons) and heat to the canopy,transpiration rates from IR will be high,nutrient requirements will be high from co2 enrichment & 1750+ umol/s new DE bulb . Did you notice any "tacoing" of the upper leaves from the heat or just an upwards claw as you said? maybe dimming it to 750w isn't such a bad idea until you dial in your regiment/setup. Ask some vet DE/coco growers for their opinions
good luck
Getgrowingson
Well-Known Member
I ran de and coco for a couple years recently switched to organic soil. I never got over 1000ppm in full flower under de hps but I watered three times a light cycle. I would back it off to 750 and get them dialed in there and flip. After first week or two turn it back up to a 1000
since1991
Well-Known Member
In his situation and room...a single ended 1000 watter (maybe on a light rail) is the fixture to use. Every one thinks doubles are the better lamp and its not necessarily so. They were never intended single lamp and in small confined spaces. They ars meant for giant greenhouse complexes and high bay warehouses...and rows of them
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VegasWinner
Well-Known Member
In a 3x5 space the most light you can push without CO2 is 750w @50wpsf.
If you want to run at 1000w you will have to use CO2. Your old hps does not have the same spectrum as the DE so your plants are getting to much chloroplast to convert so the leaves curl and turn yellow.
Carolina Dream'n
Well-Known Member
You were not watering enough. My rockwool plants get watered 6 times a day. The water holding capacity of rockwool and coco isn't too different.
A DE @ 1000w has been run in closets the same size as mine. "Too much" is an inaccurate statement. They can be made to work but obviously something in my setup is preventing it. Also look at my first post. I am currently running Co2 to the tune of around 850 PPM on average
I still don't see how feeding once a day in 100% coco isn't enough. The soil is moist to the touch 12hrs after a feeding. With that said I don't mind stepping up to two times a day to see what happens
I have C02 and the room is maintaining around 850ppm
Also Mods if his thread is better served in the sick plants section feel free to move it. On a side note I think the statements about the RH being too low is the culprite here. The light is very strong and if the plants aren't clicking on all cylinders they will struggle.
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since1991
Well-Known Member
So what do you think it is thats giving you problems???
VegasWinner
Well-Known Member
is your feeding schedule keeping up with the energy available, including levels of nutrients?
Moldy
Well-Known Member
I've got the same issue with burning/over cooked top leaves. At 1000W (AC-DE) my leaf edges curl up and some of the new leaves are burnt. Had the light about 3.5 feet above the canopy but still not far enough. Had to move down to 630W.
Care to share your Grow space and RH? Also I wonder if the 1000w would do better than the DE at 630?
stnr420
Well-Known Member
1000 watts is way too much for a 3 x 5 im0....that is classic light bleaching.....i had this happen in a 5 x 5!
I'm feeding 321 jacks around 900-1000ppm once a day in 100% coco. Each 3.5-4 gallon bag gets roughly 1 gallon of water a day. This translates to roughly 15 run off from what I'm guessing. I'm about to step it up to two gallons.
Oh how I wish you were wrong but it's looking like it. I put one of them under the 600 setting this morning so we'll see how it fares compared to the others under the T5's
Moldy
Well-Known Member
4X4 max height is 7.5', RH is 20% all of the time.