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

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

  • Yes

    Votes: 32 29.1%

  • No

    Votes: 78 70.9%
  • Total voters
    110
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churchhaze

Well-Known Member
Revolution Micro said:
LEDs win where you tune the spectrum to delete parts of the curve you don't want, so you can get away with less power for similar amounts of plant-growing light.
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Sativied said:
Which makes the white cobs for grow leds ironic, with specifically added parts (reducing photon output in the process), "optimized for bay lighting", for human eyes, not for plants.
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What you both don't understand is that it would actually be more efficient to use a filter on white cobs to get rid of "the colors you don't want" than it would be to use monos to add the colors you DO want. Of course i'm not suggesting actually using a filter on white light, but it would still be more efficient, thus making it economically unfeasible to use monos by comparison.

Satived in particular, this is what you just can't seem to wrap your head around. Yellow and green leds are so inefficient in comparison to blue leds with a phosphor coating that using yellow leds is actually less efficient by a very wide margin.
 
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churchhaze

Well-Known Member
Sativied said:
The difference lies in what inside the room is heated up more. Plants vs heat sinks for example. The room is not empty and the heat not uniformly spread. The radiated heat from hid directed towards the plants heats the plants up more than it does the air. Which can be a bad thing for some and a good thing for others. The effects a light source has on the plants in the room is what matters.
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Don't you realize that the higher efficiency is, the more of your input power is directed toward the canopy and thus heats it more? The fact that your 600W HPS is less efficient means that most of the heat is lost through conduction while only a small portion is radiated at the plant.

You've got this backwards. It's Cobs that do a better job directing heat toward the canopy because more of the input power is radiated toward it. That's what higher efficiency means.
 
CannaBruh

CannaBruh

Well-Known Member
A 100W heater does produce the same amount of heat as a 100W light.
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This assumes a closed system though ya? The plants are using light, converting it, thus removing from the system, unless we want to include plants in the system for comparing lights? So still, the device which converts the greatest amount of energy in to useful energy wins ya?
 
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churchhaze

Well-Known Member
Lets say you have 2 laser guns... 1 of them is 10% efficient while the other is 80% efficient. They're both powered with 1000W

Which one burns the target more and which one heats up your gun more?
 
Sativied

Sativied

Well-Known Member
CannaBruh said:
As ironic as it may be, it does not negate successes with COBs, imo.
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No, it's not that black-and-white indeed, it does not change the fact you can run them soft and if you put enough together you can grow decent bud with it. Success is subjective though, depends on your goals. Frankly many folks here making claims should worry more about their grow skills than saving energy.

CannaBruh said:
So still, the device which converts the greatest amount of energy in to useful energy wins ya?
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Wins the battle of which device converts the greatest amount of energy into useful energy, yes. In a vacuum where nothing else matters than that.
 
sixstring2112

sixstring2112

Well-Known Member
churchhaze said:
Lets say you have 2 laser guns... 1 of them is 10% efficient while the other is 80% efficient. They're both powered with 1000W

Which one burns the target more and which one heats up your gun more?
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I think a better question is which one do you want pointed at your eye hole lmao.shoot me with the 10%er cause i dont want no part of that 80%er
 
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churchhaze

Well-Known Member
Sativied said:
Frankly many folks here making claims should worry more about their grow skills than saving energy.
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This is where I agree with you and it's exactly why I recommend 400W HPS for most noobs starting out. Figuring out how to grow should be their biggest concern, and a 400W HPS is the best way to guarantee success at a low price for the 1 time grower. HPS is still a great grow lamp and probably still the best value for most people.
 
ttystikk

ttystikk

Well-Known Member
churchhaze said:
This is where I agree with you and it's exactly why I recommend 400W HPS for most noobs starting out. Figuring out how to grow should be their biggest concern, and a 400W HPS is the best way to guarantee success at a low price for the 1 time grower. HPS is still a great grow lamp and probably still the best value for most people.
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I disagree, you should be telling noobs to get a 315W CMH lamp. MUCH easier to get a decent crop out of one of those.
 
Sativied

Sativied

Well-Known Member
Yodaweed said:
Then why does 1000 watts of HID light make more heat than 1000 watts of LEDs? Or are we now saying LEDs and HID light make the same amount of heat.
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Depends on which side you're on :lol:

No seriously, it depends on the argument and how it suits the led fans.

In reality, if the led setup is more efficient, it won't need 1000watt led to replace 1000watt hps, and thus the led produces less warmth in the crop in multiple ways. By using less input power and by directing heat away from the plants instead of towards it.

PSUAGRO. said:
your too smart for this shit......................
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churchhaze

Well-Known Member
Sativied said:
Depends on which side you're on :lol:

No seriously, it depends on the argument and how it suits the led fans.

In reality, if the led setup is more efficient, it won't need 1000watt led to replace 1000watt hps, and thus the led produces less warmth in the crop in multiple ways. By using less input power and by directing heat away from the plants instead of towards it.
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No seriously, It actually depends on the laws of thermodynamics. He asked a very specific question involving 1000W of each, not "can you use less".

Your answer involving how it's different depending on how it suits the "fans" makes no sense. It does nothing to answer the question, but does everything to look for needless fights.

Of course it's true that you can use less, but that's not what they're arguing about.
 
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churchhaze

Well-Known Member
Sativied said:
and by directing heat away from the plants instead of towards it.
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It's HPS that directs more heat away. More efficient sources of light direct more of that heat toward the canopy in the form of radiation.

The more efficient lamps become, the more heat is directed toward the canopy and the less heat sink is needed. A hypothetical 100% efficient source would need no heat sink at all, and 100% of the power you put in would be directed toward the canopy. That means 100% of the heat is directed toward the canopy.

You're supposed to face your lights toward the plants, not away.
 
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Devildenis69

Well-Known Member
If all light is turned into heat, from where does the photosynthesis energy come from ?
plants do heat the grow space, but not all the energy they receive is restituated as heat ... some of that energy is burning in your joint ... the real name of the law should be the "Energy-Mass conservation"

A 100w lamp produces the same amount of heat as a 100w heater in a closed system, a blackbox with nothing at the outside able to steal some energy from it, here we're speaking about a grow tent with fans, different sources of heat will create different distribution of heat, that way making it more or less easily removable ...
 
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CannaBruh

CannaBruh

Well-Known Member
Light will return to "heat" (process for transferring energy) assuming it's just bouncing around in a closed system. In growing we're using this heat/light to promote photosynthesis. I do not know the by product of photosynthesis in entirety, or much at all, but I do know that the end goal calls for us human to remove some plant matter at the end of it all.

Devildenis69 has a better way of putting what I am thinking to words ;)
 
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