3000k vs 3500k Vero 29 full cycle?

[Trippyness]

Greetings,
About to pickup a bunch of Vero 29 for a few tents I have.

I seen a post and spoke to a guy who got 12oz more with a 3000k over a 3500k same strain, same clones, just differant CCT.

My main question is I am going to be vegging and flowering under these.

What temp is best?

Would like some facts as well.
I see 90% of grows are with 3500k, but the extra weight is tempting to pickup the 3000k.
Anyone else experience this?

Regards, Trippy

 

[optzulu]

The reason ppl go for 3500k Cree is becouse the 3000k is lower binned.

Vero 29 dont have that so I would go for the 3000k ore maybe do a little test with the 2700k from Vero.

 

[Trippyness]

The reason ppl go for 3500k Cree is becouse the 3000k is lower binned.

Vero 29 dont have that so I would go for the 3000k ore maybe do a little test with the 2700k from Vero.

Already made an order for the 3000k. I was unaware the 3000k from Cree was binned lower than the 3500k.
Good to know.

 

[Dankistino]

Already made an order for the 3000k. I was unaware the 3000k from Cree was binned lower than the 3500k.
Good to know.

Where was that reference to the big yield improvement with 3k? First ive heard of any significant effect from 500 difference in K.

 

[dandyrandy]

I started my first diy with 3k veros. Switched to 3500 3590's. I then swapped 4 of my 3500 3590's for 3k's the last couple runs. I expect to switch to the new vero 3 k's next summer.

 

[Trippyness]

Where was that reference to the big yield improvement with 3k? First ive heard of any significant effect from 500 difference in K.

@dro-man80 is the guy.
I will quote what he has said in a few messages.

BEGIN QUOTE
Hello my friend,I actually am finishing my update on my journal today...Ive been MIA for a month due to personak issues,but I will def post my results with you...Im in a bit of a rush right now so I will answer you briefy and write a more detailed reply lateer..
The 3000 80-CRI TopBin blew the 3500 TopBin away by quite a bit...I yielded almost 12 OZs more on the 3000k side..The flowers were just as colorful,not a shade less or mor...,and the bulk was just undeniable,I recently just finished a new build using the 3000k90 CRI to see if they do even betteer then the 80CRI...but I will still use the 3500K in a seperagte flower roo so I can do more absolute test and copy the Data for everyone...Now I am currently about to take the 3500k out of the main flower room and put the new 3000k90CRI build to replace and put the 3500k in the smaller flower room,but I can tell you now that even in Veg the 3000k is exactly on point with the 3500k side as of right now...to be honest they are exact..being all the same cut from the same mother,I can assure you the 3000k would be my recommendation...In flower its noticably different...I would make your veg room half the size of your flower room also if you had any questions about tht....Gotta run right now brotheer but I will be back on later and am trying to finish up my last uns journal tonight also...YOu will be very satified with the COBS...I will NEVER go back to HID lighting ever...And this is from a 10 year growing life using them...Much love and peace my friend
Journal: https://www.rollitup.org/Journal/dro-man80.886788/
END QUOTE

Seems there are quite alot more people who prefer the 3k over the 3500 or 4000k but due to binning not being on par.
I picked up the new Vero 29 3000k Gen7 from Digikey due to this reason and binning being good and spectrum also being good in that CCT. Plus dro-man80 convinced me. If the Gen 7 wasnt available I would have went with 3500k.

 

[Trippyness]

I started my first diy with 3k veros. Switched to 3500 3590's. I then swapped 4 of my 3500 3590's for 3k's the last couple runs. I expect to switch to the new vero 3 k's next summer.

I just picked up the Gen 7 3000k Vero 29.
Cant wait for the futuer of COBS and price drops

 

[Dankistino]

Wow maybe i can swap out a few of my v29's. I've got the old 4k @2.1mA. I wouldn't be surprised if a light tweak could have a big impact. In my room I pop in a t5 to mix up the spectrum a lil bit and the plants love it. It's not a par boost because the room is already over the top with par. It's def something about the hortilux spectrum.

I currently run 360 w @4k and 200w @3500.

@Trippyness

do you have the data sheet for the v29 3k?

 

[Rahz]

A radiant watt of red or blue provides fewer lumens than green/yellow and since Cree bins by lumens it doesn't tell us much. A top bin 3000K will have similar efficiency to a top bin 3500K. The higher K chips are actually a bit more efficient because they contain more blue and less red, but the difference isn't as much as the lumen bins might suggest, it's more like a couple percent. If the additional red produces more photosynthesis then it may more than offset the small loss in efficiency.

I think additional real world data is needed. The quote by @Trippyness doesn't indicate the size of the grow so 12 oz doesn't indicate how much more efficient the 3000K was, but from the look of things it seems substantial. It would be interesting to know yield numbers so we can derive a percentage increase.

I devised a weighing system based on the Mcree photosynthetic response which indicates 3000K being about equal with 3500K. I've always liked the growth characteristics of 3000K but if it turns out the response for 3000K is greater than equal, even better. I remember @churchhaze mentioning he though the 3000K was better but couldn't be sure, so it will take more than one person to really nail this down.

I'm running a test, but only 4 subjects under each light. I think I'll get some relevant results but if we could get multiple people doing grows with 2 different spectrums that would provide a better basis for figuring this out than any one person can do on their own.

 

[Trippyness]

A radiant watt of red or blue provides fewer lumens than green/yellow and since Cree bins by lumens it doesn't tell us much. A top bin 3000K will have similar efficiency to a top bin 3500K. The higher K chips are actually a bit more efficient because they contain more blue and less red, but the difference isn't as much as the lumen bins might suggest, it's more like a couple percent. If the additional red produces more photosynthesis then it may more than offset the small loss in efficiency.

I think additional real world data is needed. The quote by @Trippyness doesn't indicate the size of the grow so 12 oz doesn't indicate how much more efficient the 3000K was, but from the look of things it seems substantial. It would be interesting to know yield numbers so we can derive a percentage increase.

I devised a weighing system based on the Mcree photosynthetic response which indicates 3000K being about equal with 3500K. I've always liked the growth characteristics of 3000K but if it turns out the response for 3000K is greater than equal, even better. I remember @churchhaze mentioning he though the 3000K was better but couldn't be sure, so it will take more than one person to really nail this down.

I'm running a test, but only 4 subjects under each light. I think I'll get some relevant results but if we could get multiple people doing grows with 2 different spectrums that would provide a better basis for figuring this out than any one person can do on their own.

I do also want to know yield numbers.
@dro-man80 please give us some more details on yields, strains etc.
Very interesting info that you have gathered.
Espcially regarding lumens per watt with reference to blue vs red.
I would also like to see a comparison for myself.
I already picked up the 3000k Vero 29. If your tests show promise more of the higher K side I will look into it then.

 

[Trippyness]

Wow maybe i can swap out a few of my v29's. I've got the old 4k @2.1mA. I wouldn't be surprised if a light tweak could have a big impact. In my room I pop in a t5 to mix up the spectrum a lil bit and the plants love it. It's not a par boost because the room is already over the top with par. It's def something about the hortilux spectrum.

I currently run 360 w @4k and 200w @3500.

@Trippyness

do you have the data sheet for the v29 3k?

http://www.bridgelux.com/products/vero-series#specifications
Datasheets

From a few guys around this forum 3000k seems like a better choice for me.
Would like to see some more tests another test though

 

[Dankistino]

http://www.bridgelux.com/products/vero-series#specifications
Datasheets

From a few guys around this forum 3000k seems like a better choice for me.
Would like to see some more tests another test though

Thanks man. I forget which drivers are used in the optic. Ill taks a look at lights on. The old optic 360 uses 1meanwell driver per cob @2.1. Pretty sure forward voltage are different between old and new gen cobs. I interested in testing out 3k.

 

[sixstring2112]

i have a bunch of 2700k and 3000k mixed going next to my 3500k setup right now.its only been about 18 days but i like what im seeing from the 2700k side alot

 

[Trippyness]

Thanks man. I forget which drivers are used in the optic. Ill taks a look at lights on. The old optic 360 uses 1meanwell driver per cob @2.1. Pretty sure forward voltage are different between old and new gen cobs. I interested in testing out 3k.

Optic runs the COBS very High, if I were to run any COB at high Amperage it would be a Vero.
I prefer to run mine at 1400ma, for around 50w a COB and 1 Cob per SQ/f.
No worries mate.

 

[Trippyness]

i have a bunch of 2700k and 3000k mixed going next to my 3500k setup right now.its only been about 18 days but i like what im seeing from the 2700k side alot

I have been hearing some good things at the lower CCT.
You vegging under them as well? You seen any serious stretch and hows the node spacing?

 

[dandyrandy]

I just like the buds a bit better under 3k and since vero is the latest cheapest out there I'll buy 16 to squirrel away.

 

[Trippyness]

I just like the buds a bit better under 3k and since vero is the latest cheapest out there I'll buy 16 to squirrel away.

I personally dont think the Crees are worth it for me.
90CAD vs 35CAD and efficiency is quite close. Id much rather slight wattage increase than to pay those prices.
many years to recoup those costs.
Have herd that people like the bud under 3000k more. What do you like specifically against the 3500k?

 

[Matt Kitski]

I've been using the 4000k spectrum with great results. No complaints with the frost and the 4000k should help the plants stretch less if that is something you need.

There is also a spectrum chart that shows the vero's 4000k light spectrum graphed out compared to the cree's that you might want to take a look at.

 

[Trippyness]

I've been using the 4000k spectrum with great results. No complaints with the frost and the 4000k should help the plants stretch less if that is something you need.

I would like to see some proof in regards to the stretch and node spacing with 4000k over a 3000k.
I have Vegged under HPS and MH a long time ago and I much preferred the HPS Veg ( hortilux Blubs).

 

[Matt Kitski]

You'll be able to find information in it in the forum. It should be very easy to find since it's relatively well known that more red's in the spectrum cause the plants to stretch more. Sorry I don't post pictures. I have done 2 runs with COBS so far and have definitely noticed closer node spacing vs. an HPS. I didn't post the comment hoping to be doubted. Just more so to add my input since I'm currently using it and have already seen the results. Also you stated that you were running it in BOTH veg and flower. You would have more stretching in the flowering stage and have less compact bud sites.

Good luck!