Am I ready to put the pot under light? (Picture)

ouncie

Active Member
Go for it, I use floros for veg phase and switch to 400w for flower phase. Before I bought the floros I used the 400w for seedlings but it was too intense for the young seedlings, hope this helps.

Ouncie.
 

Distiller

Active Member
Maximum light requirements for seedlings are 375 foot candles. a 400 w metal halide even two feet above the plant gives off 8,000 lumens. Definitely overkill and could very well harm your plants.
 

frmrboi

Well-Known Member
Maximum light requirements for seedlings are 375 foot candles. a 400 w metal halide even two feet above the plant gives off 8,000 lumens. Definitely overkill and could very well harm your plants.
LOL, where you diging up these "facts"
I've sprouted in full summer sun with no "harm" in fact they thrived like no other grow under lights.
 

Distiller

Active Member


Using the inverse square law of I = 1/d^2 which is Intensity = Light Output/Distance^2. A 400 w HID has 32,000 lumens. The end result is 8,000 at 2 feet away. Not only is the actual light output too high for seedlings, the heat given off could fry your plants.
 

sweetarded

Active Member
BS, a 400 watt is far less intense than sunlight, in the wild seedling wil sprout in full sunlight.
a few days ago i burned two seedlings to death in sunlight and unaltered potting soil. they turned yellow, shriveled up and died. it wasn't lack of water; the UV here was too much for them.

socks, if you're using a high-wattage light i'd let it get some actual leaves first. at least the two cotelydons. but i have almost zero experience
 

jonblaze420

Well-Known Member
I put all my seedlings under 400 W HPS LESS than 2 feet away and if you have alright circulation it's fine. For this grow and my last grow.

My plants are as tall as I am now at Day 17 since the 12/12 switch. I do 24/0 light for vegging.
 

frmrboi

Well-Known Member
a few days ago i burned two seedlings to death in sunlight and unaltered potting soil. they turned yellow, shriveled up and died. it wasn't lack of water; the UV here was too much for them.
you have to sprout them in sunlight not move them outside after a weeek or so indoors under a skimpy light. or harden them off gradually.
In real life MJ starts in full sunlight with no problem.
 

suTraGrow

Well-Known Member


Using the inverse square law of I = 1/d^2 which is Intensity = Light Output/Distance^2. A 400 w HID has 32,000 lumens. The end result is 8,000 at 2 feet away. Not only is the actual light output too high for seedlings, the heat given off could fry your plants.
Oh great another book / google warrior. Let me guess no real experience growing besides flipping those pages ehh ;)
 

frmrboi

Well-Known Member
A 400 w HID has 32,000 lumens. The end result is 8,000 at 2 feet away. Not only is the actual light output too high for seedlings, the heat given off could fry your plants.[/QUOTE]
so a 400 watt light two feet away is too hot for seedlings ? LOL
Cervantes is a quack BTW.
 

popojojo007

Active Member
just use a couple of 100w cfls. That will do the trick for the first couple weeks. Then add more cfls or invest in mh. btw cfls are fine for vegetation .
 

ouncie

Active Member
BS, a 400 watt is far less intense than sunlight, in the wild seedling wil sprout in full sunlight.

Fair point, but it burnt the shit out of my first attempt so I learnt from it and used floros. I'm not here to fill anyone full of BS, just passing on information I've picked up from personal experiences in the hope that someone else finds it usefull.

Ouncie
 

sweetarded

Active Member
basic science- plants use light to photosynthesize. they need leaves to collect light. if they don't have leaves they can't collect light. so you might as well wait til the first leaves show to put a light over it. feel free to disagree with me for any number of reasons.
you might have to pop the seed coat off her top if it's stuck, but gently.

once again i want to say i have basically zero experience with actually growing to harvest, but back east all our bud was seedy, so i've germinated lots of seeds over the years just for fun. give it a couple days on its own before you do anything
 

Bwpz

Well-Known Member
Good situation for a dimmable ballast, turn the 400w mh down to 50% and I bet it'd thrive amazingly :P Thanks for the information too, I planned on placing an unsprouted cup under my 600w mh haha xD
 
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