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I don't know, I've used both HPS and LED's and both perform well. I can say that replacing 750 watts of DE HPS with 570 watts of LED's bumped my yield up from 1.6 gpw under the HPS to 1.9 gpw under the LED with 8 sq, ft. less canopy area. Not to mention I no longer have to run my mini-split in...

Your probable over watering. Easiest way to see mag diff is over watering or using LED's

Looks like Magnesium but need more info and a little better pic,

Plant size to bucket size, please? Are you lifting the pot to check for water content or just going on a 3 day watering cycle? Old growth will not show improvement, check that newer growth isn't having problems.

That's only about 350 watts of light.

Depends on if you're skilled enough to assemble a light yourself. Self assembly will run you a $1 a watt. If your purchasing then it'll run $1.60-2.00 a watt.

If that's your budget on lighting, you'd be best served with a 1000 HPS for a 5x5. Your not going to get anything for a 5x5 that will due crap for $300.

The problem I see your having is that more than likely due to evaporation than the plants drinking it all up. I have to wrap a strip of black and white poly around my smart pots outside and depending on what the pots are sitting on I'll have to take a piece of poly and sit the pots on it also...

No hate here brother.

Just been my experience that defo is cultivar depended. Some like it some not.

So it would be more like 4 3x3 or 2 3x8. 70 pint dehuey you will need, not only do you have to take into the plants transpiration but ambient RH also and those swings.

Not enough lighting for a full 8x8, 22 wsf wont cut it.

What lighting are you running?

And you've seen my LED grows?

The simple fact is she sat on old tech for ten years while the industry flew by her, until many of us on here schooled her on what the new science had learned and expanded it's knowledge both about plant physiology and lighting.

My first flower attempt under LED's where a failure by my standards. Only better from there on out. LED's are just a tool in our growers arsenal, it's up to the grower to get the best out of whatever their tools.

It may be close but I can guess the outcome already. HGL plant will be twice the size of the HLG plant simply due to the stretch difference from the heavy red supplementation of the HGL. May both yield the same but the HGL plant will consume more area.

570 wall watts, 2.2 lb. 260 watts. 330 watts. And I don't even try to max my yields.

Depends on your limitations ,Do you want the max yield from your space restrictions or do you want most efficient use of your biggest cost in powering your lighting and environment controls ? Answer that and then I'll give you an reason.