Are LED's practical for a grow room? (24 ft x 12 ft)

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churchhaze

Well-Known Member
707humboldt said:
Sacrifice total yield and quality? Doesn't make any sense to me regardless if gpw is better.
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You don't have to sacrifice total yield for GPW!!! It was realstyle's choice to dim. I'm trying really hard not to resort to name calling here, but you're being pretty dense. I'll say it again for you, although it should be common sense. The amount of light you use is scalable. Realstyles CHOSE to favor g/W over g/sqft. That is not inherent to LED. He could easily turn his thing up to full power, he just chose not to. Do you really not understand this basic concept?
 
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Scotch089

Scotch089

Well-Known Member
churchhaze said:
Find me one LED seller that lists efficiency on their advertisement. Find me one. Remember, efficiency is a unitless number between 0-1. They feed you all sorts of other BS numbers.. sure.., but if most of them told you their efficiency, nobody would ever buy them, because gavita's efficiency makes almost everything look like a joke. 42% is very high. The people getting 50% efficiency with DIY are underdriving to extreme levels, and using top flux bins, which means huge startup cost.. Most led units you can buy are actually lower than 30% efficiency, many lower than 15%..

Even the highest quality (most expensive) companies that use the highest quality leds don't list efficiency. The new area51 panels coming out soon are actually only going to have 40% efficiency. Do you think their ad will say "btw, gavita is 2% better efficiency than our latest and greatest Cob lamp?", because that's basically what's going on.

In order to find efficiency, you have to rip the SPD chart out of the individual cobs datasheets using a pixel reader to essentially count pixels, then do some calculus to find LER (luminous efficacy of radiation). Efficiency = luminous efficacy of source / LER . LER for the cxb 3000cri 80cri phosphor, for example, is 325lm/W, so if you get 150lm/W of that spectrum, for example, it's 150/325 = 46% efficiency. 325lm/W is what you'd get for a 100% efficient lamp with that spectral distribution (SPD). Notice how the units all cancel out.
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He's refering to me in the rols thread church. Don't bother. I tried.
 
707humboldt

707humboldt

Well-Known Member
And I will say it again, I still doubt that even if he cranks it up or what ever, the yield is still not going to be that of a DE hps. No matter what led it is or who is growing it. Show me a led room that is getting 2+ per 4x4 area
 
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churchhaze

Well-Known Member
707humboldt said:
And I will say it again, I still doubt that even if he cranks it up or what ever, the yield is still not going to be that of a DE hps. No matter what led it is or who is growing it. Show me a led room that is getting 2+ per 4x4 area
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Well you're simply incorrect. I don't know what else I can say. Those lights are ridiculously bright.
 
SPLFreak808

SPLFreak808

Well-Known Member
The only reason for cobs is gpw. Gpw goes down as power goes up, pretty much swaying itself away from the original reasoning why one would build it in the first place. I got to say though, i give it 5-10 years and gpw will go up.

Not looking for an argument. Just my reasoning. Its too soon to go all out with cobs. By the time you get your money worth they will probably have chips with twice the output per watt, which you will still have to wait a while for the price to drop if you're a broke ass like me lol
 
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churchhaze

Well-Known Member
The OP's question was answered. You should use 1000W DE to build the room. This section is for LED. You have no experience with it, so fuck off.

Take your 1.7umol/J pro lamp with you.
 
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707humboldt

707humboldt

Well-Known Member
You can't show me because it doesnt exist. Thats my point. I know all I need to know about led, its not as good as DE hps. Might be an led section, but the question involved DE which is my area of expertise..


You shouldn't get so upset over what people say on the internet. :wink:
 
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churchhaze

Well-Known Member
My cxb2530 3000k 80cri U2 bin at 500mA DIY build is ~2.4umol/J dissipation. It encompasses gavita's bubble.

I'm happy you can get good results with HPS. You can flower pot under 1000W of cfl. You won't get great results, but to each his own, right?
 
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churchhaze

Well-Known Member
Meanwhile, the same people who are skeptical of LED rush out to replace their veg lamp with expensive T5HO setups. Out of the pot, into the frying pan.
 
707humboldt

707humboldt

Well-Known Member
What does cfl have to do with anything? Who use 1000w of cfl? I don't use t5s to veg. T5 for clones only. I use 1000w mh. With 1000w Mh your plants don't have to be adjusted to the light going outside or under 1000w hps. Also grow way faster & stronger under 1000w mh and they don't stretch out as much.
 
Darth Vapour

Darth Vapour

Well-Known Member
churchhaze said:
My cxb2530 3000k 80cri U2 bin at 500mA DIY build is ~2.4umol/J dissipation. It encompasses gavita's bubble.

I'm happy you can get good results with HPS. You can flower pot under 1000W of cfl. You won't get great results, but to each his own, right?
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hmm but you can flower under T5 and pull same if not better then LED lol

Here 8 - 9 week veg under 48 watts T5 Ho sunblasters :) and some other ones 48 watt T5 HO in 5 gallon and getting ready for some full power Gavita;s and one picture of a friends T5 Ho harvest plants so really are the cobs stacking up real styles looking at them thin stemed plants not really to me there STRETCHED TO FUCK meaning not enough power to do the task anyone can fill a room with plants thats fuck all but have them fully produce is another topic right
 

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a mongo frog

a mongo frog

Well-Known Member
Darth Vapour said:
hmm but you can flower under T5 and pull same if not better then LED lol

Here 8 - 9 week veg under 48 watts T5 Ho sunblasters :) and some other ones 48 watt T5 HO in 5 gallon and getting ready for some full power Gavita;s and one picture of a friends T5 Ho harvest plants so really are the cobs stacking up looking at them thin stemed plants not really to me there STRETCHED TO FUCK
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Thats a bad ass bud shot dude!!!!
 
AquariusPanta

AquariusPanta

Well-Known Member
Greengenes707 said:
Then elaborate on why it's outdated.

And as for saving money...he specifically said he wanted to.

I know about leds as a whole(95%+ of them and what they can and can't do) ...you know some about cobs, veros sepcifically. My bubble encompasses yours. And my bubble also merges with hps and induction. As well as a few grow methods. Dare I call my bubble a world or planet...with many different lands/counties of expertise. Not just cobland and its' inhabitants.
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Ok, he specifically stated that he wanted to avoid temperature spikes and high electric bills, not save on start up costs.

You most definitely have a better grasp over the lights that are currently available, as you've used most, if not all of them. And as far as growing, I'm a noob in comparison to you.

But this thread isn't about you or me, so why bring it there?
 
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