What will me yield be? 4000 Watts has

100 plants in 2 gallon pots day 4 flower. I keep ph at 6.0 and ppm at 1900

2000-4000 grams.

I hope your PPM meter is broken, I'd expect some trouble soon, if it isn't.

So far i don’t see any burn

I would drop to 1200 max

1.5 lbs per light
If they dont burn at 1900ppm

go big or go home

even with co2, that sounds high. without... cue horror movie sound track when the cute girl is wandering around frantically in the dark with a failing flashlight......

What sort of media and nutrient delivery are you using?
I could see fertilizing once a week in a soilless mix @ 1900 ppm with plain h20 between fertigations.
In hydro that number sounds crazy high.

So what's your Ec at? PPM are based on 2 different conversions. My plants usually burn at anything over 800 ppm @ .7 conversion.

I don't think you will yield much at those #'s in hydro.

NoobgrowerLbc said:

100 plants in 2 gallon pots day 4 flower. I keep ph at 6.0 and ppm at 1900

Click to expand...

6lb or less would be my guess

4-6 pounds is my guess

7#

About a pound

Enough to get high

Those remind of Glue, i only say that because the weak vine like stems. ( I hate how spindley and weak her branches are)
Your def gonna need a trellis or some support.
I can totally see your whole crop falling over and laying on top of each other.
Im saying this from experience, and it looks like your gonna have a hard time getting around those tables but im telling ya get in there now because week 5 and up is gonna be a nightmare when shits starts flopping over.
Anyone who has ever had to do this knows what im talking about, its takes like 5 minutes to untangle 1 plant from the rest of the plants by the time your done your covered in resin and itch like a mother fucker and the last thing you wanna do is trim.

That's a lot of light....honestly if you had just one 1000w bulb on each side of the room on a light rail light mover then you would get that yield with less electricity usage and less heat to deal with...definitely look in to light rail movers, those, and co2 in a sealed space, are the only 2 things absolutely guaranteed without fail to "blow your shit up"....your ppms are high, but so is the amount of light you're using, but I doubt that those plants can handle 1900ppm of nutrients regardless of the light given...you will yield based off the sheer volume, but it won't be close to what you would get if you used half the lights and put them on a light mover

It just makes me wonder when you break it down, you have 4,000 watts of light...how are you cooling this? Let's say for example you use your home central a/c at about 2500 watts, now you're sitting at 6500 watts. Add to this equation the fans, ballasts etc and the wattage used goes crazy. Then look at your yield and compare it to those watts used...are you getting a gram per watt? Because if you're not yielding at least 6500 grams then you failed from a cost perspective, this is where light movers come in to play....seriously, look in to them, they would benefit this garden tremendously.