Flowering under 6500k?

littlejacob

Well-Known Member
Bonjour
If you use both mh and hps you get better results than hps only...but mh alone give fluffy buds...
So you suggest that using 3000ºk would shortened bloom??
I plan to grow a 20/22 weeks sativa...only 1 plant...2 weeks grow under 5000ºk...6/8 weeks stretch under 5000ºk to prevent big stretching...and 3500ºk to the end!
Have a great day ★
 

speedyganga

Well-Known Member
Why would HPS be more efficient than MH? Could it be that the HPS produces more usable PAR than the MH for a nominal given wattage?
Well why would that be? Ah yes, (full circle to original point) warm light gives better production than cool light for flowering cannabis.
Even if the MH had more lumens being emitted, that doesn't necesarrily mean that the plant easily uses those lumens.

I find your reference to CMH irrevelvant.

MH are less efficient than HPS.
600W MH gives less photons than 600W HPS.
So comparing MH to HPS when talking about spectrum is useless... HPS will always give better result because it is more efficient at first place.

Now regarding CMH, 600W CMH would give me more photons than 600W HPS, it means it is more efficient.
Is the CMH spectrum WARM ? not really.
Is it better at flowering ? Idk, but you seem to know better than any one so figure it by yourself

I am not here to give answer just to say that comparing 2 spectrum by comparing light that are not equal in efficiency is irrelevant. When comparing you need only one parameter. here there are 2 : electrical efficiency and spectrum...



You do understand the difference between lumens and PAR correct?
How are you "comparing" these light sources? Lumens, PAR, energy consumed? Or let me guess. You are comparing data sheets and trying to figure it out on paper?

Yes I do understand sir, but looking at the way you talk 3 lines above you don't...

Electrical efficiency does not directly translate to a higher yield. That is why figuring out the spectrum is important. So you know how to get the best use of the energy your light source is consuming.

Yes it is true, but by looking at Mc cree curve, almost all of the spectrum of MH and HPS will be taken by the plant. Anyway they adapt to the light they receive.
Finally spectrum is more about hormones, any spectrum will make photosynthese, but warm spectrum might induce more flowering hormones. And i guess 6500K more trics, and this is what I smoke...

Are you saying you basically got the same results with 50% of the energy used with the 3000k, as you did with 4000k at double the wattage?!
Are you making my case for me?
Because I've flowered under 5000k and 3000k. And the warmer light gave better production. Period.
Just keep asking yourself why nobody flowers under MH.

No, I am saying 200W of half 3000K and 4000K give me same result so far as 200W of 4000K but flowers mature quicker.
Also I don't give a fuck about you being right or wrong, I grow that is it.
And I will figure for myself if 3000K is the best or not.
I don't think many people would try flowering with 6500K but a test might provide some surprise, that is all I am saying.
At the end I flower under 4000 and 3000K so... Just stop comparing HPS and MH like this, it is only half relevent.
 

speedyganga

Well-Known Member
So you suggest that using 3000ºk would shortened bloom??
I plan to grow a 20/22 weeks sativa...only 1 plant...2 weeks grow under 5000ºk...6/8 weeks stretch under 5000ºk to prevent big stretching...and 3500ºk to the end!
Bonjour from lyon little frog ;)
From what is see so far, 3000K + 4000K is about a week in front of my last grow with only 4000Kbut is not from same clone... It just seems quicker to me.
Good luck with this sativa !!! do you mind me asking what strain is it ? I would like to grow the y griega and breed it to a quicker sativa such as TGA Jack or a C99, I also have a great grapefruit yielder mum that would benefit a push in THC production.

I don't care about dense bud in fact, I realise huge bud are not always the best, the more surface the better for resin production I think.
Also I wonder if including more blue or flowering with 6500K would give me less yield but better quality. I am a personal grower, so quantity is not important.
 

littlejacob

Well-Known Member
Bonjour
From Cannes...
The sativa is some seeds a guy I know gave me a few years ago (3 or 4?) I met him at a friend birthday and he had this very good weed...I gave him some of mine and he done the same...4 seed were in the bud and I kept it since...it is a Red panama cross with zamal...it is going to be long if the seeds pop!
Did you try UV to increase trichs production?
Have a nice day!
 

alesh

Well-Known Member
Why would HPS be more efficient than MH? Could it be that the HPS produces more usable PAR than the MH for a nominal given wattage?
Well why would that be? Ah yes, (full circle to original point) warm light gives better production than cool light for flowering cannabis.
Even if the MH had more lumens being emitted, that doesn't necesarrily mean that the plant easily uses those lumens.

I find your reference to CMH irrevelvant.

What are you comparing here? A 4200k bulb vs a 3100k bulb? Have you seen the difference between the spectrums of the two bulbs? There are very little differences between the two, and they are both tailored for a "warmer" spectrum.
Hmmm...



You do understand the difference between lumens and PAR correct?
How are you "comparing" these light sources? Lumens, PAR, energy consumed? Or let me guess. You are comparing data sheets and trying to figure it out on paper?
Electrical efficiency does not directly translate to a higher yield. That is why figuring out the spectrum is important. So you know how to get the best use of the energy your light source is consuming.



Are you saying you basically got the same results with 50% of the energy used with the 3000k, as you did with 4000k at double the wattage?!
Are you making my case for me?
Because I've flowered under 5000k and 3000k. And the warmer light gave better production. Period.
Just keep asking yourself why nobody flowers under MH.
https://en.wikipedia.org/wiki/Electrical_efficiency
Read it very, very thoroughly bro, you need it.
 

alesh

Well-Known Member
Bonjour from lyon little frog ;)
From what is see so far, 3000K + 4000K is about a week in front of my last grow with only 4000Kbut is not from same clone... It just seems quicker to me.
Good luck with this sativa !!! do you mind me asking what strain is it ? I would like to grow the y griega and breed it to a quicker sativa such as TGA Jack or a C99, I also have a great grapefruit yielder mum that would benefit a push in THC production.

I don't care about dense bud in fact, I realise huge bud are not always the best, the more surface the better for resin production I think.
Also I wonder if including more blue or flowering with 6500K would give me less yield but better quality. I am a personal grower, so quantity is not important.
I actually think that if you could provide high intensity with 6500K you could great results. Very dense and frosty. g/W might be somewhat lower though.
 

cdgmoney250

Well-Known Member
https://en.wikipedia.org/wiki/Electrical_efficiency
Read it very, very thoroughly bro, you need it.
Yeah wow... I feel like quite an ass hat :dunce:.
Well, let retract my previous statements and put my foot in my mouth.
I don't know where, but I could have swore I read somewhere that MH produces more PAR but less Lumens than HPS because lumens are weighted on a "warmer" scale.. But clearly I was mistaken.

I would also like to apologize to @speedyganga. Sorry, I was coming off like douche, I was just having a bad day. But you were completely right, and I wrong. Sorry bro :joint:
 

alesh

Well-Known Member
Yeah wow... I feel like quite an ass hat :dunce:.
Well, let retract my previous statements and put my foot in my mouth.
I don't know where, but I could have swore I read somewhere that MH produces more PAR but less Lumens than HPS because lumens are weighted on a "warmer" scale.. But clearly I was mistaken.

I would also like to apologize to @speedyganga. Sorry, I was coming off like douche, I was just having a bad day. But you were completely right, and I wrong. Sorry bro :joint:
MH is less efficient than HPS (more of the input electrical energy is converted to light). But it's also true that HPS produces much more lumens per radiated energy which means that if you have two (MH & HPS) systems producing same output in lumens, the MH one would putting more energy/photons.
 

speedyganga

Well-Known Member
Yeah wow... I feel like quite an ass hat :dunce:.
Well, let retract my previous statements and put my foot in my mouth.
I don't know where, but I could have swore I read somewhere that MH produces more PAR but less Lumens than HPS because lumens are weighted on a "warmer" scale.. But clearly I was mistaken.

I would also like to apologize to @speedyganga. Sorry, I was coming off like douche, I was just having a bad day. But you were completely right, and I wrong. Sorry bro :joint:
No worries dude, it happens to everyone ;)
You can still try to flower under 6500K so that every one is fixed ^^

@alesh
How much do you think might be sufficient ? 1000ppf ? I am already at 1000ppf under 3500K vero
 

littlejacob

Well-Known Member
Bonjour
I was wondering how I could try to flower under 5000ºk...?!?
When my vegg room is going to be available...before summer most of the time it is empty for 8 weeks when the last plants finished flowering...!
Now it is going to be full...lol..I would never have done this with a mh or a vegg cfl!
Thanks for the idea!
CU!
 

EfficientWatt

Well-Known Member
You need to add red to change the ratio B:R

Adding 660nm oslon reds would be the best way imo. Maybe something like 10W of deep red for 50W of 5000K (just guesstimating ...)

If you would be running on a 700mA driver, you could even simply add some on the same string ... with a switch to include them or not, you'd make it a veg and flowering lamp ..

have a look at these : http://www.ledrise.com/product_info.php?info=p2605_Osram-Oslon-SSL--High-Power-Hyper-Red-LED--400mW--645nm--Square-PCB-1x1cm.html&language=en&action=add_product

Bonjour
I was wondering how I could try to flower under 5000ºk...?!?
When my vegg room is going to be available...before summer most of the time it is empty for 8 weeks when the last plants finished flowering...!
Now it is going to be full...lol..I would never have done this with a mh or a vegg cfl!
Thanks for the idea!
CU!
 

littlejacob

Well-Known Member
Hey Guys, 6000K or 3000K will be better for seedling?

Bonjour
4000ºk or 5000ºk would be great!
Depend on the height you have...close from plant 4000 and far 5000ºk (imho 5000ºk "crush" a bit the plants...if you don't want short and bushy plants choose 4000ºk!)
CU
 

DackEW

Member
Ohh Hello, I did not know that, unfortunately I have already ordered few 6000K. I thought they have lots of blue. I have already have blue leds between 420nm-480nm wavelengths too, how about if I use these instead the 6000k in the first two weeks? Than after they go under to the 3500K 3590CXB.
 
Last edited:

redzi

Well-Known Member
I only am going to comment on this old thread because it popped up on a google search. 6500 is a great color IF... some Wild Thai I grew loved this color. It was such a beast that I fed it run off from my other coco grown plants.
 

RenaissanceBrah

Active Member
Don't do it.
Not nearly enough red/amber/orange/yellow in the spectrum to produce quality flowers. It might yield okay, but resin production will suffer greatly.
I've also run mixed spectrum and don't recommend that either. The spectrums don't blend by the time they reach the canopy and you end up with different types of growth (in a not-so-good way). Do your research, pick a kelvin temp and go for it.
Sorry to revive old thread - but just wanted to ask a noob question - how come resin is important for growers? Is it just a thing that looks cool, or does it correlate to better effects and such? I always hear about it but never was sure.

Also on the hunt for a LED specifically for landrace sativas, and wanted to grow with a 5000K or 6500K Kingbrite LED but seems like everyone is recommending a 3500K or 4000K LED.
 

Hollatchaboy

Well-Known Member
Sorry to revive old thread - but just wanted to ask a noob question - how come resin is important for growers? Is it just a thing that looks cool, or does it correlate to better effects and such? I always hear about it but never was sure.

Also on the hunt for a LED specifically for landrace sativas, and wanted to grow with a 5000K or 6500K Kingbrite LED but seems like everyone is recommending a 3500K or 4000K LED.
Resin contains thc, which is the psychoactive part.
 
>
Top