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Unfortunately it's not an option with the extraction set up the way it is. The air exchange rate is too fast and the co2 would be extracted before the plants could make use. However once the 4x4 tent is in place. And the lighting in cooled independently of the tent this will absolutely be a...

Well sir I guess I can see it both ways. I just feel that a 12 sq ft would be a bit underlit with the lumen output and distribution of a single 600w. But that's not to say i haven't seen people get excellent results with it. However I am having EXCELLENT results with the lumen output and...

So youre saying a 600 w hps at 24" from bulb is OPTIMAL lighting for a 12 sq ft area or a 4ft x 3ft area with ACERAGE co2 concentrations? I could see how this would be SUFFICIENT for a decent yield and quality but I doubt it's optimal...do you have any source you could provide to prove the...

Are u saying 7500 lumens per square foot. Or at any given point? What unit of measurement are you referring to? Perhaps in missing something. But I haven't had a problem yet...so far, excellent results. The damn...upload a file...button doesn't work! Lmao

Oh I'm sure its a bit overboard. But not as much as you may think. I wish I could figure out a way to post pics so I could show you how it's been doing SO FAR this grow...

If this were true it would render the inverse square law as it pertains to lumen depreciation invalid!

I am not so sure. Seems to me that the bulb rating for Lumen output is relative to the bulb not the area it will be used in (which would be measure by L/SF in order to determine the amount of actual light in a given area.)

And if you refer to jonjon's attachment which is one of the most commonly viewed charts online my measurement of lumens is almost exact. Based on wattages and distance from bulbs. So really...I'm right where I want to be...5,500 lumens/PSF.

Here's a look at the tent.

It's basic lumen depreciation based on inverse square law. Lumen output is reduced to 1/4 value every twelve inches. 100,000 lumens at 12" is 100,000. 100,000 lumens at 24" is 25,000 lumens 100,000 lumens at 36" is 6,250 lumens And so on and so on. This makes sense that my 108,000 lumens at 16"...

Have you tried measuring light? Do you know the proper way? I have a light meter that measures in lux and fc. I zip the door open just enough for my hand and meter to slip through. I place my meter where I want to take a measurement and allow it to measure for a min and settle then I record the...

So you see...am I really running 108,000 lumens or is it more like 45,000? I'd say measurements taken at canopy are far more accurate than those taken at the the bulb, or 12 inches from source. Or even worse...the box the bulb came in.

Because if 850w (600w in cooltube 250w bare bulb vertical) is only measuring average of 45,000 lumens then measurable lumens and manufacturers rated lumen output differ by about 50%. And in only about 16" from the 600w and 10" from the 250w. I just want to reiterate and be clear...this is AT...

So it sounds like ur relying heavily on the manufacturers rated lumen output and not what's actually measured. Have you tried measuring the lumens lux or par AT CANOPY to see what your plants are ACTUALLY RECEIVING?

I've got 50w uvb in my current 2x4 and I have 100w uvb for my 4x4 1000w hps 250w mh vertical Nd 100w uvb. That's the plan!

And I am much more concerned with quality than yield. Enough light, broad spectrum, good nutes, temps, RH, airflow. Btw I am doing autoflowers in canna coco with all canna line nutes in 3 gal airpots.

But u just said u aim for 7,000+ L/SF... And I'm only at 5,000+ L/SF

I have a 1000w for my 4x4 tent. This is second grow in this 2x4 tent with the 600w but this is the first time using the vertical 250w mh with it. I figured is try it. I did and temps didn't go up but 2 degrees so I said WHH NOT lol

CNt figure out how to post a pic or I would show you how well my Berry bomb is doing in there right now 8):clap:

Regardless there would be to realistic way to increase co2 concentrations with that rate of air exchange. And decreasing the rate of air exchange would increase temps too much.