The Dark Secret of LED lighting

Abiqua

Abiqua

Well-Known Member
Darth Vapour said:
No i am not trying to down LED lighting not at all but lets face it honestly people are preaching it like a fucking religion haha when in fact many other lights also grow plants as for your bad rep for what smashing a mars LED unit only thing you proved is its well build after what 200 hammer beats to it and you hardly put a dent in it hahaha
Mars LED units works there is no denying it tons of journals with some decent results
there is lots of hype in LED
and lots of false info like saying a unit is all USA parts There are several colors used in LED's that are not made in the US. It's like a company "claiming" they use Cree diodes, which in some cases they are. Fact is, Cree only makes about 2 of the colors used in say a 7 band array. So the first question to a company using Cree should be, ok so what do you use for the other 6 colors outside of white?
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White isn't technically a "color"....
 
Abiqua

Abiqua

Well-Known Member
Darth Vapour said:
This comes to my next valid question has anyone actually tested leds at certain wattages i mean not sure exactly what actual power used 70 percent of led wattage i? for the longetivity its under driven hence the longer life hrs ..
Has there been tests where a person clocks the LED and test CRI / umol etc see what its getting does it increase or diminish is there a shift somewhere does or lowers wattages and does same tests ???
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Many many times
search any of these users.....

StardustSailor
SupraSPL
Greengenes707

along with anyone else I forgot: positivity, MC130p, aquarius panta, churchhaze of course too
 
hyroot

hyroot

Well-Known Member
the lower cri have more green. And can penetrate more. the trade off apparently isn't worth the higher cri

nobody preaches. Every single time someone makes a thread or posts a question asking about led. Everytime explain what lights are best and what's cheapest and pros n cons of both. Then some led hater jumps in talking all kinds of shit on led. Talking about their yields under hps. Without considering all the variables. They always know someone who knew Someone who did an led grow with a piece of shit Chinese light like 8 years ago.so they have a broad generalization with zero experience. It turns into an argument when their beliefs are challenged and proved wrong. It warps their fragile mind and they can't handle it. Take it or dont but don't make an led hater thread or jump in a thread just to talk shit. That's professional trolling.
 
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churchhaze

Well-Known Member
80cri is higher than 21cri of HPS. 2.4umol/J is higher than gavita DE can offer. The video you posted said to make sure you look at the datasheet for the flux bins. I am using the cxb2530 u2 flux bin. Check the datasheet for the U2 flux bin like the guy said. Then notice he also says that when run at a higher current, you get lower efficiency. The flux bin ratings tell you the lumens at a 800mA drive current. At 500mA, efficiency is greater, and the datasheet shows that too. It's all summarized in the cob efficiency thread for easier reference. I am running my cxb2530 U2 bin at 500mA rather than the test current of 800mA.

It's not so much a bunch of religious zealots defending LED's as much as making sure people have correct information.

 
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CellarDweller

Well-Known Member
Dear Lord..... Some people just love trying to throw faeces.... Like monkeys in a zoo.

Unfortunately this faeces is old and irrelevant. I couldn't give a shit how LED compares to HID or HPS or MH or plasma or or or or.... I care how it compares to the sun first and foremost. I know there IS a comparison to light bulbs to be made... But as I will never use them I'm only interested in whether what I grow is as good or better than what can be grown across 365 days outside.

But.... As usual, lightbulb luddites enjoy coming here and throwing faeces. How many LED converts do the opposite? Bah.

So in summary.... Maybe light bulbs are better.... I don't give a shit, I don't claim anything other than the fact my COBs are outperforming the weather in Germany.

This is a fact. One which will change slightly as we move into Summer perhaps.... But frankly as I extrapolate weather conditions across the whole year I reckon indoor growing wins.

Of course this is a Marijuana growing forum and you knew this already :)

Light bulbs work. So do COBs. The End.
 
hyroot

hyroot

Well-Known Member
Bad Karma said:
I have better taste than that, thank you. You're confusing me with beefbiscuit, or whatever his name was.
I know I haven't been posting much in this section since it became DIY central, but I will be back with vengeance, soon enough.
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no joke I honestly thought you had a couple black stars a few years back. I guess not..
 
bicit

bicit

Well-Known Member
Darth Vapour said:
Also people are using the efficiency all to often and throwing th e CRI out the window and again people are being mis lead just like a religion
tell me something same strain 70 CRI LED and 100 CRI the sun one grown inside one grown outside who would win in size and yield ?? see what i am getting at CRI is very important but again people sluff that under the table and opt to its more efficient make sense ???
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Cri is only relevant to human lighting applications. your comparison isn't a valid one due to a large number of uncontrolled and unaccounted variables.

Technically speaking, incandescent bulbs have a cri of 100. If cri is the metric we should be after, and not efficiency, then why would we use anything else?

http://en.m.wikipedia.org/wiki/Color_rendering_index
 
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Rahz

Rahz

Well-Known Member
Rahz said:
COBs in the community (and so far in retail) aren't described by their potential. If we run a COB at 50 watts, it's a 50 watts COB.
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I was just looking at a COB lamp website and I need to retract my statement. It seems the numbers are inflated to include the driver's efficiency plus some for rounding up to a nice even number. Should a lamp be rated by it's input or output? Is rounding up justified? I have an interest in this since I plan on offering lamps in the future.
 
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churchhaze

Well-Known Member
Rahz said:
I was just looking at a COB lamp website and I need to retract my statement. It seems the numbers are inflated to include the driver's efficiency plus some for rounding up to a nice even number. Should a lamp be rated by it's input or output? Is rounding up justified? I have an interest in this since I plan on offering lamps in the future.
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It should be rated by it's output/input, although consider that most people are told to look for lm/W and not consider anything else. If you have good efficiency (watts out/watts in), it will be less recognized than straight up luminous efficacy of source... People will smugly ask "if it's so efficient, why does it output so few lumens?" and they will be asking rhetorically. They will not listen to your answer. (they're smarter than you, and you're a con man). At that point, it's their turn to do the talking, and that's when they start to teach you about LED.
 
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churchhaze

Well-Known Member
rob333 said:
was it just me or did any1 eles pass out about 1min 23 secs in ?
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The video was actually pretty accurate for what it was talking about. He even talked about flux bins, lower drive currents meaning higher efficiency, and how you can't just use red+blue and expect good results. The thing he did not expect is that 6 years later, there would be white leds that could produce red by converting blue to red using phosphors more efficienctly than red leds directly. He also did not expect us to have a high density platform where we could underdrive a huge amount of leds to the extreme just by slapping a few more cobs on.

Bottom line is that inda-gro now can not compete with most DIY vero or cxb builds in terms of efficiency, nor can HPS.
 
Rahz

Rahz

Well-Known Member
churchhaze said:
It should be rated by it's output/input, although consider that most people are told to look for lm/W and not consider anything else. If you have good efficiency (watts out/watts in), it will be less recognized than straight up luminous efficacy of source... People will smugly ask "if it's so efficient, why does it output so few lumens?" and they will be asking rhetorically. They will not listen to your answer. (they're smarter than you, and you're a con man). At that point, it's their turn to do the talking, and that's when they start to teach you about LED.
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I think I will list both along with the efficiency and lumen output. Providing all that info up front might save me a few headaches, and help the customer with their decision.

I've got a semi-final enclosure design picked out, already have a prototype I'm working on. 300w output, 140 LPW. There's not a lot of space inside after the heat sinks are in there. I'm looking at all the wiring that needs to be crammed in there without disrupting the air flow and it's going to be a challenge to make it work. I think it will be a competitive offering, all aluminum, under driven, and a highly usable light footprint.
 
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AquariusPanta

AquariusPanta

Well-Known Member
Abiqua said:
Many many times
search any of these users.....

StardustSailor
SupraSPL
Greengenes707

along with anyone else I forgot: positivity, MC130p, aquarius panta, churchhaze of course too
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He mentioned me!!

:o

lol

;)

Darth Vapour said:
No i am not trying to down LED lighting not at all but lets face it honestly people are preaching it like a fucking religion haha when in fact many other lights also grow plants
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Why do people preach religion? Some would say it's because religion helps lost souls get through the dark times.

Not many individuals are preaching about red+blue LEDS but more so white COBS, due to the simplicity of creating DIY fixtures that perform just as good, if not better than what's commercially available in the other sectors of horticulture lighting (induction, HID, plasma, etc.) and all at a relatively affordable price.

It's the same reason people enjoy growing their own fruits and vegetables rather than buying from the store; they get to enjoy their own work's success. Not many other lights offer that factor, with the only ones I can think of being screw-in bulbs, which ,let's face it, aren't really that challenging or rewarding in comparison.
 
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