Seedlings under LED lights

MrBologna

Member
I’m curious how high and what strength I should hang my light for my seedlings. I have an HLG 650r. Has 10 dimmable settings with 630 watt max.
 

Hugo Phurst

Well-Known Member
From Royal Queen Seeds


Clones and seedlings: 5,000–7,000 lux
Vegetative growth: 15,000–50,000 lux
Flowering: 45,000–65,000 lux
Maximum recommended amount of light: 75,000 lux
 

Ray.Ray

Member
Hi .. This year I decided to buy seeds and try to start them and grow .. I bought 5 seeds and got 1 bonus .. GG#4. I wasn't sure of when to start this process so I started the process of seeds in water Apr 4 .. followed instructions paper towel... on Apr 7 all 6 sprouts were about 1/2 inch long and I planted. (shout out to Crop King Seeds) Now 8 days later I have them under a cheap grow light. I currently have them on a timer 16 on 8 off; just reduced from 17 on 7 off . I plan to move them outside as soon as they grow a little more and the weather permits.. in Eastern Ontario Canada.
I have uploaded some pics for your assessment. Am I going to run into trouble with the lack of strength in my 48w light. I am trying to avoid too much stretch. Very minimal heat comes off the light. I have a small fan I blow on them gently for a couple hours a day. Humidity and temps are not great. Roughly 40% humidity and temps from 18-20 C. I have a heater but it drops the humidity so I don't run it unless the humidity rises.

How do they look? What problems am I going to run into soon?
 

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hotrodharley

Well-Known Member
Hi .. This year I decided to buy seeds and try to start them and grow .. I bought 5 seeds and got 1 bonus .. GG#4. I wasn't sure of when to start this process so I started the process of seeds in water Apr 4 .. followed instructions paper towel... on Apr 7 all 6 sprouts were about 1/2 inch long and I planted. (shout out to Crop King Seeds) Now 8 days later I have them under a cheap grow light. I currently have them on a timer 16 on 8 off; just reduced from 17 on 7 off . I plan to move them outside as soon as they grow a little more and the weather permits.. in Eastern Ontario Canada.
I have uploaded some pics for your assessment. Am I going to run into trouble with the lack of strength in my 48w light. I am trying to avoid too much stretch. Very minimal heat comes off the light. I have a small fan I blow on them gently for a couple hours a day. Humidity and temps are not great. Roughly 40% humidity and temps from 18-20 C. I have a heater but it drops the humidity so I don't run it unless the humidity rises.

How do they look? What problems am I going to run into soon?
Don’t worry about seedling stretch too much. Just bury the long stem when transplanting.
 

inth3shadowz

Well-Known Member
I've tried numerous dimmer settings for seedlings...I was always afraid to have it full blast, until this last time I said fuck it let me try. Started at 100% with a 240w spider farmer. 3ish feet away. Much faster growth and I see no signs of stress. Different strokes!
 

King Avitas

Well-Known Member
I ran my SF 4000's at 50% power and about 56" above the seedlings. Definitely not the right light for the job but I just ran with what I had. I don't think it was bad for them just be careful running big lights over small plants.
 

Cynister

Well-Known Member
I had a seed grow 4X faster than I ever have seen anything grow. In wet paper towels the tap root was 4 inches long when the others were just at an inch. Transplanted to soil and that beauty stretched it legs so much I thought she wouldn't survive. Planted her deep so the leaves were the same height as the others and at 7 weeks she's a beauty; wider, taller. You just never know. I can't wait to see how she finishes.
 
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