Have any of you DIY COB Growers finished a crop under 1000W DE HPS? - POLL

a mongo frog said:

You want to see a 2 gpw with gavita? That would be roughly 4 pounds in a 5x5 or so area. No ones posting those kind of numbers here with cobs i don't think.

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Then keep looking, cuz they're around. Look on GrowMau5's thread. There's a video of a California dispensary testing the Spydr BML1200 along with three brands of DE fixture. Gavita was the best of the DE but the Sypder slaughtered them all, and they reported up to 2.0gpw on some strains.

ttystikk said:

Then keep looking, cuz they're around. Look on GrowMau5's thread. There's a video of a California dispensary testing the Spydr BML1200 along with three brands of DE fixture. Gavita was the best of the DE but the Sypder slaughtered them all, and they reported up to 2.0gpw on some strains.

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Gavita USED to be best when they basically had the market to themselves/

chuck estevez said:

let me know when a unit hits the market that works as well as a gavita, because there is a reason gavitas sold so fast when they came out. Until then, all this GPW crap and efficiency crap is all just forum fodder.

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You have a long history of talking shit without knowing anything about the subject. Maybe this time you might try boning up first?

The ONLY stat where COB LED falls short is initial cost; yep, they're expensive. So's a new 'Vette, but no one's complaining because they know what it does.

So go learn what COB LED does, and you'll understand why those of us who know the time value of money are getting in big, before the crowd.

I've done 2 GPW a couple times with COB's and know someone else that also has,so I don't think it's as rare as you may think.

Those 2 GPW runs were 2.2 oz's per square foot so my COB's would do almost 3.5 pounds for a 5x5 area,and that's at 540 PPFD.

patrickkawi37 said:

I have hit over 1.5gpw with single ended . 2gpw under gavitas is happening . And efficiency means different things to different people. Price per fixture, grams per square meter, grams per watt, grams per kW/hr. All have some sort of effect on your ROI . I feel that LEDs are only a benefit to growers with small setups . That's my opinion. But you don't see any dudes killin it with warehouse setups nothing but leds unless they were free

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2gpw under a light bulb? ANY light bulb? Pics or it didn't happen. You and I have had this conversation before- and there weren't any pics then, either.

captainmorgan said:

I've done 2 GPW a couple times with COB's and know someone else that also has,so I don't think it's as rare as you may think.

Those 2 GPW runs were 2.2 oz's per square foot so my COB's would do almost 3.5 pounds for a 5x5 area,and that's at 540 PPFD.

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...and I think we're all just getting our games dialed in with COB LED and there's even more to be had.

Also if you take into account that gavita is now recommending a 1:1 de to plasma light to enhance the spectrum and increase quality you'll also see that overall system efficiency is now even lower. Is the quality better than cob led? 99% chance no. So still a 2.3 umol/j + fixture is going to produce more product per watt vs a 1.7 umol/j fixture no matter what. System efficiency with gavitas and plasmas you are at 1.4 umol/j or less at this point. All the guys that are really doubting build a light we will help you. Once you see them for yourselves you'll be a believer. Hell it sounds to good to be true to me and I build/sale them every day. I'm still in awe at times when I get feedback from customers. I may post some of the emails I recieved if the customers give me permission.

chuck estevez said:

let me know when a unit hits the market that works as well as a gavita, because there is a reason gavitas sold so fast when they came out. Until then, all this GPW crap and efficiency crap is all just forum fodder.

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yeah, theyre cheap as hell, $0.40/watt

patrickkawi37 said:

I feel that LEDs are only a benefit to growers with small setups . That's my opinion.

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i dont want to tell you your 'opinion' is wrong but it makes zero sense to me
-better yield
-better lumen maintenance/zero bulb replacement
-more scalable
-less heat per unit of electricity or per lb of crop
-better coverage as opposed to high wattage point sources
-eiciency improving dramatically year over year
-costs falling dramatically year over year

everything about this should tell you that it is inevitable it will domiante the commercial space soon, just a matter of when

BOBBY_G said:

yeah, theyre cheap as hell, $0.40/watt

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I just did the math in my head and came up with a surprising result; both the Gavita fixture and COB LED chips (bare) are running about .40 a watt.

That whole initial cost thing will cease to be a barrier very soon, indeed.

Also if you count the cost of the plasma to bolster the spectrum into the equation and cost of bulb changes/extra electricity these lights aren't such a big up front investment after all.

you forgot to mention that the rest of the investment is aluminum which lasts forever and 95% efficient drivers with a 250,000 hr rated life

in 3 years you'll give away your old chips and bolt on the newest versions to your existing heat sink/driver setups

at that point 70% eff for 0.40/watt will be the norm

i could see HPS literally being outlawed into obsolescence like high water toilets and old incandescents

ttystikk said:

2gpw under a light bulb? ANY light bulb? Pics or it didn't happen. You and I have had this conversation before- and there weren't any pics then, either.

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Can you not read homie? I said I have done over 1.5gpw. And I have supplied your Trollin bitch ass with pictures before and didn't even get a. "Good job" so fuck off.
Return on investment. There is none when your spending shitloads on fixtures . Leds are cost efficient if you're in a small room and they are the difference of Ac or no Ac . otherwise they are an overpriced joke. Call it an opinion but you do this for a hobby.. You don't know all angles of what's efficienct from a business standpoint.

1000 W of gavita = $400 = 350 PAR W -> 2 lbs every 8 weeks
1000W of 60% efficient COBs = $2000 = 600 PAR W with better spectrum and less heat to remove ->4 lbs every 8 weeks

i know its hard to wrap your head around paying for the expensive fixtures in the difference in yield from less than one cycle but its true

Stephenj37826 said:

Also if you count the cost of the plasma to bolster the spectrum into the equation and cost of bulb changes/extra electricity these lights aren't such a big up front investment after all.

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You already know no ones doing that.

BOBBY_G said:

i dont want to tell you your 'opinion' is wrong but it makes zero sense to me
-better yield
-better lumen maintenance/zero bulb replacement
-more scalable
-less heat per unit of electricity or per lb of crop
-better coverage as opposed to high wattage point sources
-eiciency improving dramatically year over year
-costs falling dramatically year over year

everything about this should tell you that it is inevitable it will domiante the commercial space soon, just a matter of when

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Better yield... So there is a fixture that can pull 3 pounds from a 5x5 space with 1 fixture ? Is it 2grand too?
No bulb replacement.. I pay 25 bucks per bulb twice a year . Less heat.. I pay 13cents per kwhr at commercial space so electicity is not a big deal at this point . Cost falling after a few years... Believeable.. It's like buying a car vs a lease .. Let's be real.. the technology is growing, who's to say there isn't something better in less than 5 years. I would definitely want to upgrade, at which point you wouldn't have paid the difference between hps and the initial cost of your cob fixtures... When I start a new room I don't end up using left over stuff, I just buy new shit. So initial cost is a huge thing.. And considering I don't ever think I will keep 1 grow area for more than a few years each spot.. I don't see the ROI coming back . My opinion. Where are all the dudes with 10+ cob light setups? They aren't around..

BOBBY_G said:

you forgot to mention that the rest of the investment is aluminum which lasts forever and 95% efficient drivers with a 250,000 hr rated life

in 3 years you'll give away your old chips and bolt on the newest versions to your existing heat sink/driver setups

at that point 70% eff for 0.40/watt will be the norm

i could see HPS literally being outlawed into obsolescence like high water toilets and old incandescents

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I'll be advocating for it!

a mongo frog said:

You already know no ones doing that.

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Huh? When did you become a commercial horticultural lighting expert?

patrickkawi37 said:

Can you not read homie? I said I have done over 1.5gpw. And I have supplied your Trollin bitch ass with pictures before and didn't even get a. "Good job" so fuck off.
Return on investment. There is none when your spending shitloads on fixtures . Leds are cost efficient if you're in a small room and they are the difference of Ac or no Ac . otherwise they are an overpriced joke. Call it an opinion but you do this for a hobby.. You don't know all angles of what's efficienct from a business standpoint.

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I saw your pics and liked them. I didn't see any that proved 2gpw tho, so I stand by my comments. Maybe if you didn't tell tall tales, you wouldn't get trolled so hard.

Your comments tell me you don't know about ROI, commercial or otherwise.

Another big mouth with no experience in the tech trying to tell people who are living the results how it's impossible/impractical.

Five years. Crow will be served... cold. The conversation will include my hobbies vs my life's work.

ttystikk said:

Huh? When did you become a commercial horticultural lighting expert?

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Been one for the last 10 years.