alesh
Well-Known Member
Seems like you'd benefit from reading the 3590's spec sheet.
What to add to 8 cxb 3590 cobs?
- Thread starter Actionbone
- Start date
Actionbone
Well-Known Member
Cxb3590 at 700 should be at 32.72v each x 8 = 261.76 so if my maths are ok I have like 26.24v
Actionbone
Well-Known Member
Looking in that direction now, 4 reds/2 Blues or only reds... Going to check the monos options to max V and W
@alesh you know the umols/j of royal blue monos? Thx
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salmonetin
Well-Known Member
....los ratones se dan un festin... cuando el gato no esta....
...se le notan las prisas... a los ratones...
pd...viejo refran de buhos...
...pm me when you can or like...
...se le notan las prisas... a los ratones...
pd...viejo refran de buhos...
...pm me when you can or like...
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oops my goof, mistook 36V from opening post for the actual Vf
alesh
Well-Known Member
About 3.9 µmol/J.
EfficientWatt
Well-Known Member
Hi @Actionbone
Personally, I'd add deep red to extend the red peak; Osram 660 3T are good with 80° angle out of the box. Otherwise cree .. (Here is one place for them : http://www.ideal-spectrum-led.com/produit/star-20mm-oslon-hyper-rouge-660nm-ssl80-bin-3t/?lang=en)
Not sure is there are any good 430nm ? I'd add them before anymore 450. Maybe even 480ish, to try and flatten/round the blue peak.
EDIT : Here is the 3K spectrum (3.5K has dips in same place, just more blue relatively ...) aligned on plant response curve to illustrate what I mean ..
Personally, I'd add deep red to extend the red peak; Osram 660 3T are good with 80° angle out of the box. Otherwise cree .. (Here is one place for them : http://www.ideal-spectrum-led.com/produit/star-20mm-oslon-hyper-rouge-660nm-ssl80-bin-3t/?lang=en)
Not sure is there are any good 430nm ? I'd add them before anymore 450. Maybe even 480ish, to try and flatten/round the blue peak.
EDIT : Here is the 3K spectrum (3.5K has dips in same place, just more blue relatively ...) aligned on plant response curve to illustrate what I mean ..
Actionbone
Well-Known Member
i finally go with 3500k +some 660nm im going to do a face to face with only 3000k cobs for the next mounth in 2 80x80 tents
Future Skills
Member
So I've read that running at a lower current results in each COB running at a slightly reduced voltage, but I haven't been able to find out how to calculate it on my own. I'm basically trying to determine how much room is left over on each of my drivers. Can someone show me how to determine the actual voltage of COBs running softer (700ma or 1050ma)?
boostedhonda
Well-Known Member
a 36v cob ran at 700 mA would be running at 25.2 watts (36v x.7 amps=25.2 watts) and 37.8w at 1050mA
VegasWinner
Well-Known Member
You are going to need an lpc-35-700 to run the diodes peace
dandyrandy
Well-Known Member
Seeds
boostedhonda
Well-Known Member
a hlg 185h c700b can run 8 36v cobs and will be dimmable, cheaper than buying individual drivers
TRK
Active Member
I don't find my way around here that often. Sorry to resurrect an older thread, but felt my question was much along the same lines as the original post
I recently went from HPS to CXB3590 CD 3500K 36V. I picked that choice simply because of the wealth of knowledge I had consumed over the couple of years of lurking and reading about COB while I made my mind up, seeing a lot of practical experience on that particular chip, kindly provided to me by those over here at RIU mostly, you know who you are, the usual suspects both ages past and more recent
Anyway so yeah the results in my own room so far have been pretty staggering, and so I figure let's go all in and throw out the HPS altogether and go all COB
So I ask, what would be the best COB addition to the 3500K Cree I already have (675w worth currently in a three bars of four cobs config)?
I'm thinking Vero 29 Gen 7 because of the virtually equal efficiency and significantly lower cost, which was about 21 USD for Vero and about 37 USD for Cree. I will look to add about the same wattage again, probably in a setup of four bars of three cobs so I can have them in an opposing pattern in between the bars I already have and then everything will work out nice and symmetrical as possible with minimal hotspots
I understand all the other specifics like drive current, thermal management, and all the nitty gritty... really my question is only of a Kelvin temp nature, in essence, what fits best in spectral terms to Cree 3500K, or where do you feel that spectra is lacking? I know there is traction gaining with people who consider high CRI to be better somehow because of Emerson effect and such things, but isn't sheer photon output and delivery the king of the whole COB equation? Am I working on outdated info?
I simply don't have the practical experience yet to decide for myself, having not even completed a run with COB yet. But honestly, I have been so impressed i thought I better get planning LOL
Thanks for your help fellas
TRK
I recently went from HPS to CXB3590 CD 3500K 36V. I picked that choice simply because of the wealth of knowledge I had consumed over the couple of years of lurking and reading about COB while I made my mind up, seeing a lot of practical experience on that particular chip, kindly provided to me by those over here at RIU mostly, you know who you are, the usual suspects both ages past and more recent
Anyway so yeah the results in my own room so far have been pretty staggering, and so I figure let's go all in and throw out the HPS altogether and go all COB
So I ask, what would be the best COB addition to the 3500K Cree I already have (675w worth currently in a three bars of four cobs config)?
I'm thinking Vero 29 Gen 7 because of the virtually equal efficiency and significantly lower cost, which was about 21 USD for Vero and about 37 USD for Cree. I will look to add about the same wattage again, probably in a setup of four bars of three cobs so I can have them in an opposing pattern in between the bars I already have and then everything will work out nice and symmetrical as possible with minimal hotspots
I understand all the other specifics like drive current, thermal management, and all the nitty gritty... really my question is only of a Kelvin temp nature, in essence, what fits best in spectral terms to Cree 3500K, or where do you feel that spectra is lacking? I know there is traction gaining with people who consider high CRI to be better somehow because of Emerson effect and such things, but isn't sheer photon output and delivery the king of the whole COB equation? Am I working on outdated info?
I simply don't have the practical experience yet to decide for myself, having not even completed a run with COB yet. But honestly, I have been so impressed i thought I better get planning LOL
Thanks for your help fellas
TRK
Randomblame
Well-Known Member
3.000k/cri90/52 or 68v version and maybe add a few good reptile uvb t5's to enhance terpenes.
VegasWinner
Well-Known Member
I prefer the cree cobs as they can be driven at lower power; lumens/watt; and deliver more light than most other cobs. For flower plan on 50w/sf; example if you have a 5x5 you need 20-3500k 36v COB's with heat sinks, etc 6-185H-C1400B meanwell drivers, and you will have a monster 750-900 PPFD grow room. For veg dim to 50% and turn on the 6th driver and 4-5600K and you will not regret the move.
redzi
Well-Known Member
Yea I know this is an old topic but this thread comes in #1 for Google search for best Cree cob when it comes to the cxb series. I have mostly sativa that really does well with the 6500K...much better than the 3500K that I have. If you have heat issues and want to save some $$ get the lightimetunnel with epistar 3 watt leds. Get the one with 3 fans and dont waste money on the one that comes with the dimmer. They seem to put more frost than an equal amount of watts of Cree CXB 3590, .... but you have to start the flowering with these units otherwise you will get a bunch of yellow leaves. I have low ceilings so heat is more of an issue...if I had 10 foot ceiling it would be Cree all the way.