CXB spectrum vs output
- Thread starter SupraSPL
- Start date
You are posting on the wrong place thi
Why didn't you post on this tread in order to keep this one clean?
https://www.rollitup.org/t/cree-cxb-at-discounted-prices.892295/
SupraSPL
Well-Known Member
Thanks to Mark we were able to compare the SPD and output of the 3000 80CRi 3500 80CRi and 4000K 70CRi. Butwe will have to work on getting the SPD for the 4000K 80 CRi CD bin. Once we have that, @alesh might be able to extract the LER and QER, then Apogee should be able to get us the correction factor for out PAR meters. Once we have those figures we can more easily estimate and measure PPFD.
From what I have seen so far you cant go wrong with the 3500K CD for flowering and probably for vegging as well, but I think it is safe to say the 4000K 70 CRi DB has a higher photon count and that might trump spectrum in practice.
heckler73
Well-Known Member
By any chance do you know how he measured the "photon count"?
That is, what gear was used? I didn't see it mentioned in the OP, and I am not familiar with this person, unfortunately.
Greengenes707
Well-Known Member
It comes back to people being blinded by cobs. Phosphor is the successful tech behind it all and we have studied it pretty solidly for a while.
I flowered under 6100k years ago(2012) and was very unimpressed. And with different enhancements of that base that blew the straight high K, high output away. Specially once compared to a correct and successful flowering spectrum in the 3K range. Any one is welcome to prove it wrong...it is very much encouraged. But know it is not unexplored territory nor was I anywhere close to the first either. Just one more data set.
People think that these new levels of efficiency are going to make a difference...they will not in practice. The lower K is not far enough behind in output for it to change. Spectrum doesn't matter that much in the grand schemes and I have been preaching that for over 5 years...but people are starting to take that way too literal now days. I can say it vaguely because I have tried a lot of lights to confirm what is said about them.
My issues with 5k plus as a general light...
-25% blue maximum before photoinhibition...<15% is more ideal... <10% isn't low and has shown great in flowering plants,
-r:fr ratios...flowering times
-PS670 system...major player
-Photomorphis...deep red triggers and activity.
5K doesn't fit great with McCree...then gets worse with cannabis specific action spectras.
My own personal findings have supported that 4K is a dead zone. Backing that study of radish. Try vegging with straight 4K...snails speed ahead. I have no real answer for, it should be stellar. It's ratios and distribution are solid on paper. It flowers pretty well, but will lack the bulking in certain strains/conditions. As where the same strains with 3500k and even 3k thrive with vigor no questions asked.
And test results/potency...nothing has beat an AT600 R2. I put the best glue nugs 4K could offer head to head with AT and lost by 4%... 21% to 25%.
It also depends on what we are talking about. Most any cobs setup will produce grade A and save energy comped to sodiums.
But if we are taking about the true best lighting system...grade A+++ and the yields to boot...people need to actually develop something more than the generally effective cookie cutters...and actually test it themselves before jumping on the train.
I flowered under 6100k years ago(2012) and was very unimpressed. And with different enhancements of that base that blew the straight high K, high output away. Specially once compared to a correct and successful flowering spectrum in the 3K range. Any one is welcome to prove it wrong...it is very much encouraged. But know it is not unexplored territory nor was I anywhere close to the first either. Just one more data set.
People think that these new levels of efficiency are going to make a difference...they will not in practice. The lower K is not far enough behind in output for it to change. Spectrum doesn't matter that much in the grand schemes and I have been preaching that for over 5 years...but people are starting to take that way too literal now days. I can say it vaguely because I have tried a lot of lights to confirm what is said about them.
My issues with 5k plus as a general light...
-25% blue maximum before photoinhibition...<15% is more ideal... <10% isn't low and has shown great in flowering plants,
-r:fr ratios...flowering times
-PS670 system...major player
-Photomorphis...deep red triggers and activity.
5K doesn't fit great with McCree...then gets worse with cannabis specific action spectras.
My own personal findings have supported that 4K is a dead zone. Backing that study of radish. Try vegging with straight 4K...snails speed ahead. I have no real answer for, it should be stellar. It's ratios and distribution are solid on paper. It flowers pretty well, but will lack the bulking in certain strains/conditions. As where the same strains with 3500k and even 3k thrive with vigor no questions asked.
And test results/potency...nothing has beat an AT600 R2. I put the best glue nugs 4K could offer head to head with AT and lost by 4%... 21% to 25%.
It also depends on what we are talking about. Most any cobs setup will produce grade A and save energy comped to sodiums.
But if we are taking about the true best lighting system...grade A+++ and the yields to boot...people need to actually develop something more than the generally effective cookie cutters...and actually test it themselves before jumping on the train.
alesh
Well-Known Member
Interesting read.
My next order will be 90CRI 3000K. I'm wondering whether I'll be able to see any difference between 3500K 80CRI.
PSUAGRO.
Well-Known Member
Testing theories huh? that's something new around here....lol........so are actual GROWS TBH
have you tried 4000k/660nm GG? posi seemed pleased with it I think
BobCajun
Well-Known Member
True enough. It does seem to indicate better leaf growth at least. Since sunlight is 5780k, I figure something close to that is probably good.
wietefras
Well-Known Member
Professional have been growing with poorly suited HPS lights for decades with less than 5% blue. With leds a whole new field of research opened up in plant spectral response.
There have been several interesting test grows done by Wageningen university in the Netherlands trying out different spectral distributions. They got 15% more photosynthesis efficiency by creating a 2:1 FR:R ratio and also R/B leds performed better than full spectrum lighting. They don't test on cannabis though.
Trouble is that these tests are pretty difficult to perform by hobby growers. Especially when it comes down to fine tuning small changes. The scale is a bit small to really be certain the results are because of the light and not because of a pH imbalance, feeding error, climate difference or whatever small fault one might make on a part of a grow.
Fastslappy
Well-Known Member
just so I'm clear on the subject that's a CXB3590 ?
:-/ return to sponge mode
nogod_
Well-Known Member
If 4000K is a "dead zone" and can't outperform a 3 year old fixture with lower intensity, then doesn't the "intensity > spectrum theory" kinda go out the window? If I'm dropping $2000 on cobs I want the best possible performance not "dead-zone".
I don't think anyone who spends longer than a couple weeks on this site thinks that cobs are the be-all. Just the be-all du jour, and something simple and cheap enough to implement for the novice (a first!).
I understand your POV that you've seen lighting trends come and go but wasn't this level of LED enthusiasm the goal a couple years ago?
I don't think anyone who spends longer than a couple weeks on this site thinks that cobs are the be-all. Just the be-all du jour, and something simple and cheap enough to implement for the novice (a first!).
I understand your POV that you've seen lighting trends come and go but wasn't this level of LED enthusiasm the goal a couple years ago?
BobCajun
Well-Known Member
Yeah, 4000k is the dead zone, but 5000k is not. 4000k is right at the trough. Weird but true. 17% blue is the lowest growth zone, which is right about what 4000k has. 25% blue is the highest growth zone tested though.
hillbill
Well-Known Member
Not all 4K is the same as some have plenty of red. Also, HID's had some big gaps in spectral output and the spectrums of present white LEDs are very full and bringing that light at serious intensity. If I were concerned about big yields, and did not have an sgs and rw75, 3000 or 3500K would figure more in flower.
Some strains like a little higher k than others, and so do some humans but 3k to 4k will get the job done with no worries.
Some strains like a little higher k than others, and so do some humans but 3k to 4k will get the job done with no worries.
[QUOTE="Greengenes707, post: 12202337, member: 749428
My own personal findings have supported that 4K is a dead zone. Backing that study of radish. Try vegging with straight 4K...snails speed ahead. I have no real answer for, it should be stellar. It's ratios and distribution are solid on paper. It flowers pretty well, but will lack the bulking in certain strains/conditions. As where the same strains with 3500k and even 3k thrive with vigor no questions asked.
[/QUOTE]
Very interesting about that "dead zone". my constant tweaking of spectrums has shown me there is a sweet spot someplace between 3000K and 4000K, and might be close to the cree 3500K. building my next light with 3500Ks plus a tiny bit of deep reds and actinic blues. thanks GG for the 3500K SPD.
for veg I'm sticking with 5000K - 6500K.. Traditionally in horticulture for flowering\fruiting plants cool white is for veg, and warm white is for flowering. I haven't seen anything that changes that decades long rule of thumb.
My own personal findings have supported that 4K is a dead zone. Backing that study of radish. Try vegging with straight 4K...snails speed ahead. I have no real answer for, it should be stellar. It's ratios and distribution are solid on paper. It flowers pretty well, but will lack the bulking in certain strains/conditions. As where the same strains with 3500k and even 3k thrive with vigor no questions asked.
[/QUOTE]
Very interesting about that "dead zone". my constant tweaking of spectrums has shown me there is a sweet spot someplace between 3000K and 4000K, and might be close to the cree 3500K. building my next light with 3500Ks plus a tiny bit of deep reds and actinic blues. thanks GG for the 3500K SPD.
for veg I'm sticking with 5000K - 6500K.. Traditionally in horticulture for flowering\fruiting plants cool white is for veg, and warm white is for flowering. I haven't seen anything that changes that decades long rule of thumb.
welight
Well-Known Member
Guys
We use a Asenstek Spectrometer, the product is supported with an Grow Light App that produces the above details, you may note on our site we have produced the same chart for each CXB3590 we are selling to you guys. Happy to provide more info if required
Cheers
Mark
welight
Well-Known Member
Sorry your having an issue, I have processed 6 orders using CUTANDROLL during this period, so its working ok, can you advise your login details ie account you created and I am sure I can fix the issue for you
cheers
Mark