Flowering under 6500k?

[Seriousbuds]

I'm debating getting a bunch of CXB3590 6500k cobs for my LED panel setup. (doing 8 cobs on 1 heatsink)

Part of me wants to just do a mixed spectrum with some 6500ks, 3500ks and 3000ks

Anyone know if I should just stick to 3k or go for straight 6k or maybe a mix of all?

 

[Rahz]

I think 3000K CXB has a good red/blue balance. Mixed K generally averages out to a single K but when dealing with 6500K it's very green/blue heavy. I think adding them into a mix would work fine, running straight 6000K would be an experiment and a lot of people here would be interested in the results though it would be an expensive experiment.

Important to note is that whether it's 3000K or 6000K there's no notable output below 420nm.

 

[PurpleBuz]

I think 3000K CXB has a good red/blue balance. Mixed K generally averages out to a single K but when dealing with 6500K it's very green/blue heavy. I think adding them into a mix would work fine, running straight 6000K would be an experiment and a lot of people here would be interested in the results though it would be an expensive experiment.

Important to note is that whether it's 3000K or 6000K there's no notable output below 420nm.

that's what these are for.
http://www.rapidled.com/total-spectrum-violet-uv-led/

most of the led aquarium kit guys offer UVA leds.

 

[Rahz]

I've read several posts that stated or postulated that 4000K plus may be more frosty. I wonder why that might be if cobs don't provide UV at any Kelvin temp. Not saying it's false, just that 3000K can produce some very frosty flowers and I would be interested in any empirical evidence to support such notions.

When talking about bins, the difference between one bin and another may be broken down into the amount of blue light that's been shifted, so lumens and even electrical efficiency doesn't tell the full tale.

 

[littlejacob]

I think 3000K CXB has a good red/blue balance. Mixed K generally averages out to a single K but when dealing with 6500K it's very green/blue heavy. I think adding them into a mix would work fine, running straight 6000K would be an experiment and a lot of people here would be interested in the results though it would be an expensive experiment.

Important to note is that whether it's 3000K or 6000K there's no notable output below 420nm.

Bonjour
Realstyle made a 6500ºk cxb 3590 pannel so I bet we going to know soon about this...!
Have a great day ★

 

[BM9AGS]

Bonjour
Realstyle made a 6500ºk cxb 3590 pannel so I bet we going to know soon about this...!
Have a great day ★

Yes but he's using it for veg.

 

[Seriousbuds]

Well it's exciting that there is no answer to this question... I feel like we're exploring uncharted territory!

 

[BM9AGS]

Well it's exciting that there is no answer to this question... I feel like we're exploring uncharted territory!

Every light, temperature, spectrum has been tried. Search and you'll find that growers have been experimenting with every new light tech that had been out. Even fucking Lasers!!!
There are studies saying burple type lights should work best and there are studies saying other colors work best so go with what you want.
Burple lights do make for cool flower pictures....

 

[cdgmoney250]

I'm debating getting a bunch of CXB3590 6500k cobs for my LED panel setup. (doing 8 cobs on 1 heatsink)

Part of me wants to just do a mixed spectrum with some 6500ks, 3500ks and 3000ks

Anyone know if I should just stick to 3k or go for straight 6k or maybe a mix of all?

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.

 

[Rahz]

6500 should have plenty of orange and yellow. Let's talk Realstyles into doing a flower test! He has so many lamps he won't mind

 

[HiloReign]

If I'm not mistaken, the HID equivalent would be flowering with MH. Not an exact comparison but spectrum wise, similar. Pretty sure there are some people who do/have done this... I read it in one of those "weed gurus" books as well... That book was full of misinformation and hocus pocus lol... but you see what I'm saying...

 

[Psyphish]

6500K works great, as long as you've got enough intensity. I use a cheap chinese 6500K COB in my microbox, I'd change to 3500K, but I can't be bothered since the 6500K is working so well. Here's two different strains grown under 6500K. I definitely recommend adding higher colour temperatures to your grow area, it boosts trichome production.

 

[littlejacob]

Yes but he's using it for veg.

Bonjour
I thought it was for vegg...lol!
If you want frost...try UV!
But yes it is very frosty under 6500ºk!
CU

 

[FranJan]

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.

HooHa. I run mixed spectrum and I wouldn't flower without added spectra and my plants aren't half baked. Last round using COBs, Illumitex and Hans panels was stellar, especially density. Adding spectrum changes everything. COBs are vanilla, high octane CFL growing at it's finest but to not experiment with spectrum is either laziness, conformity or ignorance IMVHO. You think they are hanging COBs in the grow rooms at UMiss or Perdue and calling it a day? Me thinks not.

LumiGrow shows adjustable-spectrum lighting benefits

15 October 2015, by Matthew Appleb
http://www.hortweek.com/lumigrow-shows-adjustable-spectrum-lighting-benefits/ornamentals/article/1368497#disqus_thread​

LumiGrow Research, the research division of US-based horticultural LED lighting manufacturer LumiGrow, has released seven new scientific poster papers that reveal how crop morphology and productivity can be affected through the application of varied light spectra. LumiGrow research, conducted in partnership with commercial growers and universities, demonstrates breakthrough capabilities that adjustable-spectrum LED lighting now provides growers, says LumiGrow.

Three key findings from the research are:

Crop height, flowering and bushyness can be controlled through the application of varied spectra. This capability is particularly important in the flower industry, where these phenotypes are currently controlled by plant growth regulators (PGRs). A reduction in the use of PGR chemicals may be an unexpected benefit of spectrum control.

Light can be used to produce higher value food, says LumiGrow. Spectra have been shown to control flavour and nutritional value in every food tested including broccoli, lettuce, tomatoes and basil.

Adjustable-spectrum lighting has been shown to be superior to traditional, fixed-spectrum lighting in the production and longevity of flowers suitable for market.

This body of research supports the advancement of crop- and site-specific precision agriculture into greenhouses and other controlled environment agriculture environments says Lumigrow. Previous research primarily focused on optimising pesticides, nutrients and irrigation, it added.

LumiGrow is taking LED research from theoretical to practical use, as demonstrated by the success of our growers," said Melanie Yelton, director of Research at LumiGrow. Dr. Yelton leads research collaborations with scientists at the University of California, Davis; University of Guelph; and Harrow Research Centre, among other prominent institutions and agencies, along with numerous commercial greenhouse operators.

The poster research papers are:

Bush S, Maloof J & Yelton M. Analysis of Arabidopsis light-sensitive mutants grown under different ratios of LED and compared to fluorescent lighting. Poster session presented at American Society of Horticultural Science, 2015; New Orleans, Louisiana.

Byrtus J, Egan K & Yelton M. LEDs control growth and flowering in greenhouse-grown Zinnia marylandia. Poster session presented at ASA, CSSA, and SSSA International Annual Meeting, 2014; Long Beach, California.

Byrtus J & Yelton M. LED lighting can control plant growth, flavor and aroma in Ocimum basilicum (basil). Poster session presented at ASA, CSSA, and SSSA International Annual Meeting, 2014; Long Beach, California.

Byrtus J & Yelton M. Supplemental LED lighting increases winter tomato production in central North Carolina greenhouse Arabidopsis. Poster session presented at American Society of Horticultural Science Annual Conference, 2015; New Orleans, Louisiana.

Holley J, Yelton M & Heiner L. LED lighting and Phalaenopsis orchids, light wavelength effect on the flowering spike. Poster session presented at American Society of Horticultural Science Annual Conference, 2014; Orlando, Florida.

Llewellyn D, Vinson K & Zheng Y. LED superior to HPS for cut gerbera production. Poster session presented at American Society of Horticultural Science Annual Conference, 2014; Orlando, Florida.

Llewellyn D, Kong Y, Zheng Y & Yelton M. Optimum light level for snapdragon production with LEDs. Poster session presented at American Society of Horticultural Science Annual Conference, 2015; New Orleans, Louisiana.

 

[cdgmoney250]

HooHa. I run mixed spectrum and I wouldn't flower without added spectra and my plants aren't half baked. Last round using COBs, Illumitex and Hans panels was stellar, especially density. Adding spectrum changes everything. COBs are vanilla, high octane CFL growing at it's finest but to not experiment with spectrum is either laziness, conformity or ignorance IMVHO. You think they are hanging COBs in the grow rooms at UMiss or Perdue and calling it a day? Me thinks not.

I was giving my opinion from my personal experience. I have "experimented" and the results were less than desirable if just using a high and low kelvin temp COB's. I've also flowered underneath MH and HPS combined for that full mixed spectrum. In order for the light to be blended and not have different effects from one side of the plant to the next, the lights would have to be very close and that would be an inefficient use of energy.
Maybe if the COB's are close enough to "blend" the light, this will add to the fullness of the spectrum. But if the spacing of the chips is far enough apart, that would have adverse effects IMO.

You think full scale grows haven't experimented with mixed lighting? Well they have, and guess what? HPS is still the industry standard. Why would that be if mixing the spectrum was so much better? Because production trumps all, and warm lighting gives better production (both yield and resin).
Try flowering under just MH. Everybody that has tried it that I've met was not pleased with their results.
And telling people that if they aren't experimenting with lighting that they are lazy or ignorant is coming from an ignorant person. Get off your high horse man.

 

[heckler73]

Well, then, I think I'm going to scoop a decade of 6500Ks to toss in my "Beowulf Server"

 

[OneHitDone]

6500K works great, as long as you've got enough intensity. I use a cheap chinese 6500K COB in my microbox, I'd change to 3500K, but I can't be bothered since the 6500K is working so well. Here's two different strains grown under 6500K. I definitely recommend adding higher colour temperatures to your grow area, it boosts trichome production.

What strains were those? Nice color

 

[Psyphish]

What strains were those? Nice color

The first pic is an unknown accident (have her re-vegging now), the second one is Sweet Seeds Cream Mandarine F1 Fast Version (pretty lame).

 

[speedyganga]

You think full scale grows haven't experimented with mixed lighting? Well they have, and guess what? HPS is still the industry standard. Why would that be if mixing the spectrum was so much better? Because production trumps all, and warm lighting gives better production (both yield and resin).
Try flowering under just MH. Everybody that has tried it that I've met was not pleased with their results.
And telling people that if they aren't experimenting with lighting that they are lazy or ignorant is coming from an ignorant person. Get off your high horse man.

HPS are just more efficient than MH. I find your point irelevant... Look at CMH grow.

If i were to compare a 50% 6500K vs a 3000K 36% efficient light source maybe the flower would be greater under the 6500K ?!

I flowered under 4000K and I can tell you flower were dense and big. Now I put half power at 3000K and I feel the flower mature quicker but it is the only difference I can see so far.

 

[cdgmoney250]

HPS are just more efficient than MH. I find your point irelevant... Look at CMH grow.

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...

If i were to compare a 50% 6500K vs a 3000K 36% efficient light source maybe the flower would be greater under the 6500K ?!

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.

I flowered under 4000K and I can tell you flower were dense and big. Now I put half power at 3000K and I feel the flower mature quicker but it is the only difference I can see so far.

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.