What's your gram per watt?

SchweeDubz

SchweeDubz

Well-Known Member
whitebb2727 said:
That is doable.

Not really.

More accurate would be grams per kilowatts hours used.
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It might be more accurate but it's ok to discuss both. I am asking because I've heard 1 gpm is easy to hit with LED (if the grow is setup right). I want to say I heard in growmau5 videos that he's hit over 1.5. Talking gpw is also a lot easier than grams per kw hours.
 
GreenLogician

GreenLogician

Well-Known Member
I have 6 cxb3590s, four 2700k and two 3500k.
I dim them down to about 180w, and get about 1/2 oz per plant, 9 plants at a time in a 80x80cm (perpetual grow).

about 126 / 180... 0.7.
Not good, but I'm still getting used to my cobs. Nutrient issues, light burn from getting excited, maintaining warmth etc.
 
whitebb2727

whitebb2727

Well-Known Member
SchweeDubz said:
It might be more accurate but it's ok to discuss both. I am asking because I've heard 1 gpm is easy to hit with LED (if the grow is setup right). I want to say I heard in growmau5 videos that he's hit over 1.5. Talking gpw is also a lot easier than grams per kw hours.
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The only reason I say it matters depends on if you veg and flower under one light or separate areas.

If flowering under it alone the yield for a strain would be similar if it was many small plants or a couple big ones.

The difference would be veg time. You use a lot more energy and time vegging large plants.

So if you veg them 6 months and flowered then you would yield different than a 3 month veg.
 
Rahz

Rahz

Well-Known Member
SchweeDubz said:
Talking gpw is also a lot easier than grams per kw hours.
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I agree. They both describe electrical efficiency though, and while g/KwH does give the best indication of how efficient the grow was after the fact it's still not based on a ratio of yield to photons, or yield to radiometric energy.
 
SchweeDubz

SchweeDubz

Well-Known Member
I suppose I meant the light used under flowering. Moreso attempting to gauge what I can yield rather than determine how efficient my grow is. Of course it won't be completely accurate but I'm happy knowing that hitting 1 gpw with my 400w cob setup is doable. It is my goal I suppose. I think I've vegged them plenty long enough at 8 weeks.

My only concern is I'm still seeing some yellowing in some of my top leaves. Based on pictures, it seems to be potassium or magnesium deficiencies, or light burn. I can't imagine they are lacking nutrients. FFOF soil and been fed EJ w calmag. But the light is sitting about 20" above the tallest plant so I really don't know. I'll post pictures shortly.
 
GreenLogician

GreenLogician

Well-Known Member
You n me both Schwee, that top yellowing!
I've turned down my lights while I keep searching for the solution. It only happens trying to blast them with light.
Whether that's light burn, or them not getting the nutes to keep up with the growth they want to do... Yet to be revealed.
 
SchweeDubz

SchweeDubz

Well-Known Member
GreenLogician said:
You n me both Schwee, that top yellowing!
I've turned down my lights while I keep searching for the solution. It only happens trying to blast them with light.
Whether that's light burn, or them not getting the nutes to keep up with the growth they want to do... Yet to be revealed.
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Cool. I just raised my light a few inches and turned it down to about half power. My guess is light burn as most nutrient based symptoms start at the lower leaves. If it is nutrient related, I would guess a surplus before a deficiency. Last feeding they had EJ Grow, Bloom, Catalyst, Meta K, Microblast, and some Calmag. You can even see a lil bit of nute burn. Roots are coming out the smart pots like crazy though.
 

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Chip Green

Chip Green

Well-Known Member
I'm pretty sure I bleached the green right out of my latest attempt at flowering with my DIY 3500k EB strip panels. The buds look pretty good to me for 7 weeks, and I had some PH issues that had to be corrected through trial and error, but I'm feeling like I should maybe keep the "lamp" a little higher for the next batch LOL...I got fooled by the lack of heat I believe.
I'm a pretty novice grower in all reality, underfeeding/ over lighting is starting to become evident.
Flowering the original gifted mother, with a pair of clones following behind every three weeks...
The 3rd set of two is looking WAY better.... LOL
Id be thrilled with .5 gpw on the first bush I created.
 
Abiqua

Abiqua

Well-Known Member
I have made this argument before and will continue to make it, with a little refinement.....gpw is strain dependent but......since most things today are a lot of muddied polyhybrids with sat/ind genes expect to gain solid yields and eventually you will probably push even some of the best limits here....

but the caveat lies on the ends of the spectrum a bit....dont expect 1.5gpw from an 18-24 week dalat sativa or from a super early finisher like Manitoba poison, guerrilla gold or something of a 7 week finisher...its great if it happens but dont expect it with certain IBL's. :peace:
 
KonopCh

KonopCh

Well-Known Member
You make GPW from lights? I always tought that my 6 Citizen COBs consumes 220W (driven at 1.05A). But when I test with kill-a-watt meter it's says 280W. So even those who swear to GPW, must include driver loss/wattage.
 
klx

klx

Well-Known Member
SchweeDubz said:
Average or just your last yield? What is your space and which light are you using? Any other details welcome of course.

I just purchased a 400w Vero29 kit (3000k) and I'm wondering what my ball park range will be. 5 plants in my 40"x40"x78" tent. I hear hitting 1 gpw is not that hard with LED but of course there are tons of factors. These pups are 8 weeks vegging and currently in the process of going into flowering.

Edit: Just a preemptive point, I know gpw isn't necessarily the best way to measure a grow but I'm still curious. If 400g is within my realm, well, that makes me a happy man.
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I use the same lights but I have more than one so there is some overlap. With blue dream I easily get 600g (~1.5gpw) from a 1m x 1m tray. With an OG on my most recent harvest I only pulled about 400g (~1gpw) on my first run with it but it is super dank and I am confident I can get that much higher now I know how she rolls.

You dont mention what strain you have there but with plants already that size you should easily hit 1g/w unless you do something wrong.

Also, I would not dim your lights if I was you, I run my lights at full power all the time and have them closer than you do and I never get burn, just some fox tailing on some strains. I have lots of air flow in my room. Crank that fucker up to full and rain down those photons!!!
 
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PilouPilou

PilouPilou

Well-Known Member
klx said:
I use the same lights but I have more than one so there is some overlap. With blue dream I easily get 600g (~1.5gpw) from a 1m x 1m tray. With an OG on my most recent harvest I only pulled about 400g (~1gpw) on my first run with it but it is super dank and I am confident I can get that much higher now I know how she rolls.

You dont mention what strain you have there but with plants already that size you should easily hit 1g/w unless you do something wrong.

Also, I would not dim your lights if I was you, I run my lights at full power all the time and have them closer than you do and I never get burn, just some fox tailing on some strains. I have lots of air flow in my room. Crank that fucker up to full and rain down those photons!!!
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Hi!
Do you use the splayed heatsinks? If yes, are they very hot at 1.4A with the VERO29C? I tested them at 70W with citi1825 and they are relatively hot.. not too much but enough to let me think that at 95W it should be very hot!! thx ;)
 
greg nr

greg nr

Well-Known Member
KonopCh said:
You make GPW from lights? I always tought that my 6 Citizen COBs consumes 220W (driven at 1.05A). But when I test with kill-a-watt meter it's says 280W. So even those who swear to GPW, must include driver loss/wattage.
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Good point, mine is based off a kill a watt meter also. Since I have a variable output driver I use it to see how much power I'm driving them at.
 
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