Questions about light setting
- Thread starter JayMiami1221
- Start date
Herby Paisley
Well-Known Member
Hi JayMiami1221 ...You will want to have very little light or weaker lighting on your seedlings at first week or two when they sprout ... As for the heat in your tent you will want to lower that to around 70f ..75f ... Do you have an inline exhaust fan venting the air out of the tent?
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- #3
JayMiami1221
Well-Known Member
Yes I do 6 in inline to carbon filter for some reason the ac vent in that room isn’t working so it’s like a hot box
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JayMiami1221
Well-Known Member
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- #5
JayMiami1221
Well-Known Member
Herby Paisley what if I run a piece of duct from a portable ac unit into one of the vent holes?
Herby Paisley
Well-Known Member
That would probably work, If you have an extra inline fan put it in that duct and have the cold air from outside the tent blowing in and your exhaust fan up top will keep the hot air flowing out giving you some negative air pressure in your tent and with that less chance of smell escaping when you open the tent door! so win win lol 
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- #7
JayMiami1221
Well-Known Member
Sweet that’s what I’ll do don’t have a extra inline but I’m determined to make this work
Herby Paisley
Well-Known Member
LOL...Heck before I have wired a simple pc fan to a charger cord to plug into the wall and used an old soup can as the coupler to fit the 6inch inline ducting from an old portable ac unit ducting it worked great till i got another inline fan... lol So I know what your going threw!
Herby Paisley
Well-Known Member
...Oh and lots of Duct tape the grey original kind! lol
Running the exhaust to outside the room, or outside period, will help too. Exhausting hot air right back into the room will raise the room temps, which raises the tent temp more. Rinse, repeat. A vicious circle, it is.
Herby Paisley
Well-Known Member
A vicious circle lol so true! haha
Oh, the light intensity. I like to run mine on as low of a power setting as possible. I've seen people put big lights at the top of the tent, then run them at 100%. Further distance, less intensity, then as the plants grow they get higher intensity as they need it.
I get it, but I've always scratched my head at the waste of juice.
I have a little light meter I picked up off the zon (dr something or other) for about $20. Good enough to get in the ball park with white lighting.
From the above article:
HOW MUCH LIGHT DO YOUR CANNABIS PLANTS REQUIRE?
In general, for veg I'll run about 60% at 24"+/-. The week before flip I bump to 80%, a week after flip I'll bump to 100%, and lower to 18"-20". Once stretch is over, I set it to 18". The last 2 weeks I drop to 80% and lower the light to 12"-14". (Lower power used, but higher PPFD as the light is closer.)
Between seedling and veg, I ramp up over about a 2 week period from sprout. Starting at 20% at 24", then bumping it up 5% every few days.
I get it, but I've always scratched my head at the waste of juice.
I have a little light meter I picked up off the zon (dr something or other) for about $20. Good enough to get in the ball park with white lighting.
How to Use a Lux Meter to Increase Cannabis Yields - RQS Blog
Among pH testers, loupes, and refractometers, lux meters are a useful tool cannabis growers can harness to ensure optimal plant productivity and health.
www.royalqueenseeds.com
From the above article:
HOW MUCH LIGHT DO YOUR CANNABIS PLANTS REQUIRE?
- 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
In general, for veg I'll run about 60% at 24"+/-. The week before flip I bump to 80%, a week after flip I'll bump to 100%, and lower to 18"-20". Once stretch is over, I set it to 18". The last 2 weeks I drop to 80% and lower the light to 12"-14". (Lower power used, but higher PPFD as the light is closer.)
Between seedling and veg, I ramp up over about a 2 week period from sprout. Starting at 20% at 24", then bumping it up 5% every few days.
PanchoVilla420
Active Member
I'm only on my second grow so grain of salt and whatnot. I have found great luck with small 6-8" desk fan with an out spout intended for a dryer out line (as in washing machine and dryer) either plastic or aluminum hose.( Also 6 -8") But this will require a hole in the wall taking the exhaust outside or at least to another room. Hope my trial and error experience helps! Good luck good toking and goodnight
Mars Hydro
420 Sponsor
What is the wattage of your light? What is your grow area?
Recommend hanging distance:
Germination: 24-30 inches
Vegging: 18-24 inches
Bloom: 12-24 inches
Recommend hanging distance:
Germination: 24-30 inches
Vegging: 18-24 inches
Bloom: 12-24 inches
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