Gram per watt factor

Leelandgrow3 · Jul 22, 2019

So does this have a big thing to do with genetics and alot of other things just I am want some opinions to accomplish the best yeild possible

az2000 · Jul 22, 2019

Leelandgrow3 said:
So does this have a big thing to do with genetics and alot of other things just I am want some opinions to accomplish the best yeild possible

It's not a well-rounded metric. I produced 1g/w with only 18-22w/sq ft of lighting. However, the plant was large. I didn't get as much from it as I would have running stronger light. So, gram/sq ft should balance gram/watt. (Maybe cu. ft because vertical space plays a factor to. I've gotten 1.2g/w from a 2x2 4' tall space. That's more significant than growing in a 7' tall space.).

So, there's lots of variables. If you lived in Tokyo where real estate is a premium, you might not care about how much watts you use to squeeze the most yield out of a tiny grow box.

Leelandgrow3 · Jul 22, 2019

My space is 3ft by 3ft by 6ft and have two plants gonna shoot for 4 to 5ft end result plants under a 600w viparspectra led

Leelandgrow3 · Jul 22, 2019

Animal Chin · Jul 22, 2019

I also think time should factor into the GPW efficiency metrics. How long a garden takes up X amount of space seems like an often ignored but maybe important metric.
Say in a 4'x4' space, 5 medium size plants, started from seed, yield 1 GPW in 90 days.
In the same space under the same light and same strain, one plant is grown SCROG style and takes a long veg time to fill a screen. At harvest it yields 1 GPW but took 180 days to do it.
Even though both crops hit the 1 GPW mark, the 90 day garden is far more efficient and could double the annual yield of the SCROG.

Leelandgrow3 · Jul 22, 2019

Imma start running three plants in a 3by by 3 and I wanna do under 2 600w I top and main line my stuff so that takes time anyway I have ALOT OF PATIENCE

Leelandgrow3 · Jul 22, 2019

I would like to see qp or a hp but imma say more qp side so I dont upset myself lol

az2000 · Jul 22, 2019

Leelandgrow3 said:
Imma start running three plants in a 3by by 3 and I wanna do under 2 600w

Amazon says the actual power draw is 260w. If you have two, that's 520w in a 9 sq ft space. That's 58w/sq ft.

A CMH LEC 315 fits that 3x3 space perfectly. You can get them with remote-mount ballast to keep the heat lower (if that's a factor). You get UV light which LED doesn't do, as far as I know. And, you'd be running 38w/sq ft (counting the ballast).

Leelandgrow3 · Jul 22, 2019

I think leds are get better and better with growing technology yes cmh and hps have the penetration thru the canopy

Leelandgrow3 · Jul 22, 2019

But my led is blasting thru the canopy and I topped and mainlined I think I will pull a decent amount with two lights and 4ft tall plants

az2000 · Jul 22, 2019

Leelandgrow3 said:
But my led is blasting thru the canopy and I topped and mainlined I think I will pull a decent amount with two lights and 4ft tall plants

It will be harder to pull 520g than 380g. :)

More watts easily translates into higher yeild. But, there is a point of diminishing returns. At 58w/sq ft, I think you'll be in that territory.

If it were me, I'd do the CMH (38w/sq ft) and then supplement around the sides. IMO, spreading the watts *around* the plant for better coverage, having the light closer (for less inverse-square action) creates an efficiency that you can't get by adding more watts to the top.

I mentioned growing a plant at 12w/sq ft. Check out this post. (<<link). I didn't mention this earlier, but that was done using ordinary household LED lightbulbs. This goes to my point about how spreading the watts around, with lower watts closer to the plant (in more locations than one higher-watt source) creates an efficiency.

If you did 38w/sq ft CMH, and then added some 9w household LED bulbs around the perimeter (maybe 8 of them. 2 in each corner, for a total 72w of sidelight), I guarantee that would be better than 520w Amazon LED from the top. I'm talking just from mid flower to the end. You wouldn't need the sidelight until then.

Something to think about.

Jack og · Jul 22, 2019

Via Spector light won’t give ya that g/w yeilds, without side lights, you need scrog and you will need to fill that net. It’s does make for a great product quality however there is no comparison to traditional HID lights. CMH doesn’t flower well, it’s great at veg but at flower the spectrum causes too much stretch. So traditional HID to flower is still king.
Ratios; more like 1/2 gram/ watt is more feasible for a led like via spectra, which ain’t bad but it can get better with better quality leds .

Leelandgrow3 · Jul 22, 2019

What's some good quality

Leelandgrow3 · Jul 22, 2019

I was looking a meizhi but I think that's under viparspectra

Jack og · Jul 22, 2019

Leelandgrow3 said:
What's some good quality

The trichomes are loaded , fat and smokes well. But yeilds was far lower then originally thought . This was a test plant with optimal conditions and running 4x the w/power that you have and it was disappointing. Via specta for veg is great and flower it lacked

Jack og · Jul 22, 2019

2 plants about 14 zips which wasn’t bad

Leelandgrow3 · Jul 22, 2019

Which light is that?

Leelandgrow3 · Jul 22, 2019

Four times the power what watts where u using 4x the amount I have that would be 2400watts and u only got 14 zips

Leelandgrow3 · Jul 22, 2019

I only have 600 w rn so 4 x that would be 2400w and u only 14 zips I wouldn't get that strain again lol

Jack og · Jul 22, 2019

Additional pics when they filled out

Search

Search

Gram per watt factor

Gram per watt factor

Leelandgrow3

az2000

Leelandgrow3

Leelandgrow3

Attachments

Animal Chin

Leelandgrow3

Leelandgrow3

az2000

Leelandgrow3

Leelandgrow3

az2000

Jack og

Leelandgrow3

Leelandgrow3

Jack og

Attachments

Jack og

Attachments

Leelandgrow3

Leelandgrow3

Leelandgrow3

Jack og

Attachments