Top bin COB comparison

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genuity

genuity

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wietefras said:
Heh, no of course they also have light hitting the walls. Just a lot less. The AT600 has lenses on it so the light is bundled. It projects a small footprint and therefore hardly any light will hit the walls

Also with COBs you have a lot of them and some won't even be near a wall. The COBs are much closer to the canopy. The 1000W HPS is usually at 36" and COBs can be down to 8". That's a lot less wall being lit up.

I still think making sure that bit of wall is highly reflective will benefit your grown though. I personally rather make the walls reflective than install reflectors or lenses on the lights. That way only the light hitting the walls needs to be reflected. The rest can just go to the plants undisturbed

There are actually HPS fixtures that you can add extra reflectors to prevent light from hitting the walls so much. Like the Dimlux Alpha fixtures. They sell add-on reflectors thay you can mount on fixtures near the wall or corner.
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Thank you,for the simple answer.
 
wietefras

wietefras

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Sativied said:
:lol: Santa works in mysterious ways. RIU nonsense vs WF nonsense... this should be fun.
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Nonsense like calling a flooded tube (ie DWC) setup NFT? :lol:

Anyway, I'm not trying to pick a fight. The increase in yield from switching from HPS to Cree COBs is substantial, but yeah I do feel it's more in the 20 to 30% range rather than 50% to 100% range.

Although in a commercial "table grow" it might actually be that much. I have seen them hang 1000W Gavita's over tables with pathways between the tables wide enough to drive a truck around (OK slight exaggeration). That's an insane waste of light and indeed you'd be hard pressed to get even 0.6g/W with such a setup.
 
REALSTYLES

REALSTYLES

Well-Known Member
Sativied said:
:lol: Santa works in mysterious ways. RIU nonsense vs WF nonsense... this should be fun.



Where have I read that before...

*Spoiler alert*
Real world scenarios do not apply to the led fans here wietefras. They have unlimited space, their reflectors suck, their imaginary hps bulbs suck, rarely have proper ventilation/exhaust (but instead use ac...) and when they claim to have doubled their yields switching from hps to led it's because they yielded 0.5-0.6 gpw under some half-assed hps setup.
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You again. Haven't you learned yet not to speak when grown folk are talking. You have no real input when it comes to LEDs you don't even own a light.
 
Sativied

Sativied

Well-Known Member
wietefras said:
Nonsense like calling a flooded tube (ie DWC) setup NFT? :lol:
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Nah... More like claiming NFT is not suitable for large plants and then pretend flooded tubes is not NFT but dwc when proven wrong with amongst others flooded tubes setup. Fyi, the inventors of NFT disagree with you... some of the first NFT systems build in the late 70s were tubes..."Flooded tubes" is stoner forum nonsense and that transparent and desperate attempt to argue stoner semantics shows you are, like most, more concerned about projecting the illusion of knowledge than knowledge itself.

The good news is that such disregards for facts is exactly how people "discuss" in the led forum so you should fit right in. :)

Oh and not here to pick a fight either, feel free to ignore me, just here for the entertainment, love your arduino projects
 
littlejacob

littlejacob

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Bonjour
To get reflective walls...not the best but it work...you will need a few $$...or nothing...use the survival cover fireman and ambulance use...the silver and gold one...put the gold side on the grow room walls and it will be much brighter or buy some at a growshop!
And I really like @REALSTYLES hair STYLE...and it is a professional who speak...lol! At least he still have hair...!
Don't tell anyone but I think he his Lenny Kravitz twin brother...!
Long live to cob...it is something else...maybe better for those who have a lot of heat...and those who want more and pay less...or for lazy guy who want gpw without a lot of work (like me!)
CU
 
REALSTYLES

REALSTYLES

Well-Known Member
Sativied said:
Oh... Fakestyles looking for attention again... get a haircut bum.
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Attention? Why? Everyone knows who I am and they know who you are. I don't have to lie to kick it. I can show what I'm doing but you can't. Like I said before you don't have any input to this thread. You don't even own a LED light. Stop trolling. Yes I called you a troll. Only a troll will try to have input on something they have no clue on. Now back to the subject, guys I just received the new Cree CXA/2 3590 5600k BD and a HLG-240H-C1400A

SAM_1331.JPG
 
littlejacob

littlejacob

Well-Known Member
Bonjour
Why did you choose a 5600ºk?
Because it is new or it is a kind of test?
Or maybe something between 5000ºk amd 6500ºk seems better to you for vegg...but you already have 6500ºk DD the highest bin...what will be better in a BD bin?
Do you run a cob workshop in your garage?...lol!...I hope I will visit it one day!
CU
 
nogod_

nogod_

Well-Known Member
Actually no....it's in his bathroom.

But I'm sure he'd give you a tour if you brought him a nice châteauneuf-du-pape.

littlejacob said:
Bonjour
Why did you choose a 5600ºk?
Because it is new or it is a kind of test?
Or maybe something between 5000ºk amd 6500ºk seems better to you for vegg...but you already have 6500ºk DD the highest bin...what will be better in a BD bin?
Do you run a cob workshop in your garage?...lol!...I hope I will visit it one day!
CU
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REALSTYLES

REALSTYLES

Well-Known Member
littlejacob said:
Bonjour
Why did you choose a 5600ºk?
Because it is new or it is a kind of test?
Or maybe something between 5000ºk amd 6500ºk seems better to you for vegg...but you already have 6500ºk DD the highest bin...what will be better in a BD bin?
Do you run a cob workshop in your garage?...lol!...I hope I will visit it one day!
CU
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They only comes in 3200k and 5600k and the BD bin was the highest bin. @nogod_ are you jealous? lol now you are gonna have to wait because I bought all what Jerry had lol. I just need to figure out if I'm gonna use the HLG-185H or the 240H lol.
 
SupraSPL

SupraSPL

Well-Known Member
Sativied said:
Real world scenarios do not apply to the led fans here wietefras. They have unlimited space, their reflectors suck, their imaginary hps bulbs suck, rarely have proper ventilation/exhaust (but instead use ac...) and when they claim to have doubled their yields switching from hps to led it's because they yielded 0.5-0.6 gpw under some half-assed hps setup.
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You may have missed it but we are seeing "real world" documented COB grows in the 2 gpw range these days @ 700 PPFD. Even my half assed grow turned out 1.48gpw in 56 days, in soil, 750 PPFD. same ladies, same soil (literally), same tents. Not a bad improvement from .57gpw from my half assed 600W HPS I guess.
 
SupraSPL

SupraSPL

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Sativied, you seem to know a lot about Gavita so maybe you can answer this. Do you think they will jump with excitement to experiment with a lighting technology capable of game changing efficacy, or will they stubbornly resist it and be one of the last to develop LED based grow lamps?
 
alesh

alesh

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wietefras said:
It's somewhere on the Growershouse website. I have it in a PDF, but I'll try to find it back.

:edit: It's on this page http://growershouse.com/blog/best-indoor-grow-light-test/

The 36" has a max PPFD of 481 and min of 239. Filling in the blanks I got an average of 318.

I took the 24" matrix to guestimate how much would fall on a 5x5 square (light lower would reduce the footprint compressing 5x5 into 4x4). Although thinking about it I probably should have gone for the 30" matrix. Or something in between. That would only increase the losses for the 5'x5' area though.
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I see. I went by this. It's the first result on Google pics for "1000W gavita de par chart" for me. It's not a Gavita setup, though (the bulbs are the same, right?). Obviously the reflector from the Gavita setup spreads the light to a larger area. Now your estimates make much more sense.

No matter if it's 25% or 50%, drawing conclusions from these charts doesn't make much sense, that I agree.
 
wietefras

wietefras

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@SupaSPL, Gavita do sell led fixtures actually. Not for growing AFAIK, but I was there a while ago and they have a large fish tank with their aquarium led fixture on top.

I assume they must be thinking about leds for growing too.

@alesh, Yeah that's a deep lighting fixture. The bulb sits much lower in the Gavita reflector. Look at how far that Digilume reflector extends down from the bulb. Other than that it looks like a Gavita clone. Gues they didn't have much inspiration for coming up with your own design.

That Digilume reflector would be a much better option for grow rooms without reflecting walls though.
 
SupraSPL

SupraSPL

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I guess the most useful way to use the PAR meter for those tests would be to make a map without walls and another inside the tent.


wietefras said:
@SupaSPL, Gavita do sell led fixtures actually. Not for growing AFAIK, but I was there a while ago and they have a large fish tank with their aquarium led fixture on top. I assume they must be thinking about leds for growing too.
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Nice, Euroaquatics Angel is actually owned by Gavita, I guess I should have searched harder. Maybe they will develop an LED grow lamp at some point (or buy one). If they do I sure hope it is a very different design than this (generic? monos)
http://www.marinedepot.com/Euroquatics_Angel_LED_Light_System_20_Inch_LED_Light_Fixtures-Euroquatics-5U05900-FILTFILDTN-5U05906-vi.html[/QUOTE]
 
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wietefras

wietefras

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Well the light that doesn't fall on the measuring square is what would have hit the walls. In these tests that light disappears in the large black room. If you put walls around it depends on how reflective the walls are in how much you get back.

I have seen some measurements with par meters in a reflective tent. Sellers from reflective foil tend to produce those showing how their foil is better than all the others. Or grow tent manufacturers. The PAR readings from those are much more in line with what you would expect by dividing PPF/m2 of the grow area (minus some small losses).


I forgot the company name they used for those led fixtures, but that must be it. Maybe I should ask them if they are working on COBs now :) They don't sell in the Netherlands anymore though.
 
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