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help please, plant to light ratio

angypangy
angypangystarted grow question 4 years ago
hi, im germinating 4 LSD autos in peat pellets, when the shoot appears how close should the plant be to the light, ive got a 600w LED light and 4x4x6 ft tent? and what should the temp be, I live in a cold climate, thanks
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Setup. Lighting
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angypangy
angypangyanswered grow question 4 years ago
still new to this and not sure how to reply to anyone who answers my question? anyways thank you all for giving me advice and tips, muchly appreciated, fist time growers anxiety lol 👍👌👏
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Jef79
Jef79answered grow question 4 years ago
Hello.. Hope you are well.. Ideally wen they shoot u want ur light about 2-3ft(24-36inch) away..place a thermometer nxt to ur plants at the shoots height.. If u can get temps bout 22°c its perfect.. To close to light and they will burn, to far and they will stretch.. If its ur first time growing dont worry so much about being "perfect".. Its always guess work to us all.. As she gets bigger u can bring lamps closer and in full flowering u shud aim at 10-18"(depending on heat and overall size of plants).. Think about nature.. In spring its cooler and sun is higher, in summer its warm n sun is closer.. This is similar with cannabis and why ppl use "blue" spectrum in veg.. Any problems just ask the community or message.. Stay safe n gud luck with your babies.. 👍🍀
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ijustdontgiveaf
ijustdontgiveafanswered grow question 4 years ago
hi there.. usually for flowering it's best to have between 40 and 60 watt per square meter.. here we're talking about watts drawn from the wall (most LED manufacturers say 600 and then there's i.e. a real 250w draw, so be careful of that). If you have a quantum sensor, go for around 100 umol-m2-s for seedlings, 200 for cuttings, 200 to 400 for the veg-cycle, and then 400 to 850 umol-m2-s for flowering.. if you go higher than that you will have to substitute Co2 to the tent, so the plants can handle the intensity. If you don't have a quantum sensor, this makes things a bit more tricky, but then, as Shagrath mentioned, put it up high enough, as seedlings are very sensitive and then lower the distance with time. To get to the right flowering distance, i used to hold my under-arm (palm facing upward) under the light and looked at the reflection of the light on my skin. When it got lightly blinding (or i felt it getting warm), then i was around 850 PPFD (with my lights), so i knew this should be the maximum distance for blooming. good luck and happy growing!
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Shagrath
Shagrathanswered grow question 4 years ago
Do you have a dimmer in your led light? 600W is quite alot for the seedlings and you are wasting energy with that but if nothing else is at hand that should do. When seedlings sprout i'd say you can keep the led pretty far away maybe like 60cm-100cm. Optimal temperature for seedlings are 22-25C If I can remember and they like humid environment so RH should be 60-80% and you can help this by putting some kind of dome over the seedlings with little breathing holes to maintain humidity for them but don't suffocate them! 👌
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