So how do you go about changing the ppfd after a room is set up?
optimal watt / square foot or m2
- Thread starter Bolof
- Start date
So how do you go about changing the ppfd after a room is set up?
MichiganMedGrower
Well-Known Member
This is not correct. The theory is solid but HPS still puts down more PAR watt for watt than MH.
Olive Drab Green
Well-Known Member
Where is that fact not expressed? You are wrong if you think that chart is wrong. But it says exactly what you are asserting.
Olive Drab Green
Well-Known Member
@MichiganMedGrower
Where does this chart not show HPS having higher PPFD than MH, watt for watt?
SUPER HPS // 1000w | 600w | 400w | 250w
PAR Value (umol/m2/s)
1000w = 2050
600w = 1160
400w = 700
250w = 410
SUPER METAL HALIDE // 600w | 400w | 250w
PAR Value (umol/m2/s)
600w = 600
400w = 300
250w = 170
Where does this chart not show HPS having higher PPFD than MH, watt for watt?
SUPER HPS // 1000w | 600w | 400w | 250w
PAR Value (umol/m2/s)
1000w = 2050
600w = 1160
400w = 700
250w = 410
SUPER METAL HALIDE // 600w | 400w | 250w
PAR Value (umol/m2/s)
600w = 600
400w = 300
250w = 170
Porky101
Well-Known Member
that is off topic + kind of pathetic that you behave like this in the newbie central.
answer: you can add lights, change distance to light source, and so on. many ways ...
So you understand that all you have to do is lower the lights to get more ppfd, yet you think hanging them higher than necessary is "optimal".
Also if you think that is off topic, you are simply trolling... how is discussing how you manupilate ppfd off topic when it's the only thing you have discussed?
All the "good info" you have received in this thread has come from 1 chart that you can't even read, yet we are the "idiots" that don't know what we're talking about... lol
You call my math skills rudimentary yet you seem to have a tenuous at best grasp on the English language, are you a non native speaker? it would explain a lot.
You would think that if you were correct here someone, anyone, would agree with you.
You dont understand the topic. You dont know why I asked rhis question and so on. And yes, I am not a native English speaker and I dont live in the US.
Lower ligths. Get more ppfd on a smaller area. Higher = less ppfd on a larger area. Wow. You such an idiot.
MichiganMedGrower
Well-Known Member
The comment I argued said metal halide put down more usable plant light. It doesn't. HPS still does. Just like you showed. You are saying what I am saying. The myth is fuller spectrum automatically wins.
Olive Drab Green
Well-Known Member
Oh. My bad, bro. Crazy week on here lately, pardon my mercurial demeanor.
Explains why you are so bad at communicating.
You are living in some sort of vacuum where you have "unlimited space" as youve described before.
Fact is, you will have a defined area you are able to grow when you are actually growing.
Given that available space in your final setup, your ppfd will change while your available space does not change. This gives you a higher or lower ppfd IN THE SAME AMOUNT OF SPACE.
Are you comprehending this, or do I need to learn your language in order to get through to you. Or perhaps just learning how to call you an "idiot" in your native tongue will be enough...
MichiganMedGrower
Well-Known Member
Watt for watt HPS delivers much more light than MH. It is measured in lumens usually. But within those greater lumens is greater PAR still getting to the plants.
There are other benefits to the full spectrum with more blue light of a MH. Such as increased trichome production and possibly overall plant health and vigor. At least there are studies that suggest this.
But years of university testing on regular plants shows more lumens equals more growth. I still use HPS. But with added blue to the spectrum.
[QUOTE="Shugglet, post: 13123886, member: 155485"
You are living in some sort of vacuum where you have "unlimited space" as youve described before.
Fact is, you will have a defined area you are able to grow when you are actually growing.
Given that available space in your final setup, your ppfd will change while your available space does not change. This gives you a higher or lower ppfd IN THE SAME AMOUNT OF SPACE.
Are you comprehending this, or do I need to learn your language in order to get through to you. Or perhaps just learning how to call you an "idiot" in your native tongue will be enough...[/QUOTE]
You are living in some sort of vacuum where you have "unlimited space" as youve described before.
Fact is, you will have a defined area you are able to grow when you are actually growing.
Given that available space in your final setup, your ppfd will change while your available space does not change. This gives you a higher or lower ppfd IN THE SAME AMOUNT OF SPACE.
Are you comprehending this, or do I need to learn your language in order to get through to you. Or perhaps just learning how to call you an "idiot" in your native tongue will be enough...[/QUOTE]
Still communicate better than you non-educated potheads.
I live in a house and I plan to build a basement. With 1000 W / m2 I can only afford 4 m2 grow area (50 % of 220 V 16 A). So small is a bit of a joke for me. The area Will be at least 20 m2 I Hope. That is what motivates my question.
ttystikk
Well-Known Member
If power is your limitation and you haven't built the place yet, why not just add another 240V drop?
Another way to get more PPf/Watt is to increase the efficiency of your lighting. in this vein, if you plan to use light bulbs at all I strongly recommend you use 315W CMH lights with low frequency square wave ballasts. These are much more efficient than HPS and certainly MH. COB LED is even more efficient, but cost of entry is high.
Another way to get more PPf/Watt is to increase the efficiency of your lighting. in this vein, if you plan to use light bulbs at all I strongly recommend you use 315W CMH lights with low frequency square wave ballasts. These are much more efficient than HPS and certainly MH. COB LED is even more efficient, but cost of entry is high.
I dont understand what it means with "drop". I have 220 V 16 A with 3 phases = 220 x 16 x 3 = 10560 watt in total
I can increase to 20 or 25 A. That is normal for a house where I live. But to use 80 % of 25 A 24/7 is not a normal household. And it is not legal to grow herr. Much less acceptance compared to USA.
ttystikk
Well-Known Member
All the more reason to invest early in highly efficient lighting.
Yes. And water cooling. Since I want a sealed Room and Winter is good here. A small pond would be perfect.