Single 100w cob?
- Thread starter rosswaa
- Start date
apoulin
Well-Known Member
There are some members on here who are able to get 1g/w with 1 CXA, however I am not sure they are running it at 100w. The problem with running one COB @ 100w is that running it so hard diminishes the life and quality of light over time, it is also more inefficient. This is the reason myself, and many others chose to run the LEDs softer and add more LEDs instead of driving fewer, harder.
If you plan on using one COB I would recommend one in the 3K range, members seem to have good luck with that spectrum for the entire grow if it is their only light source.
rory420420
Well-Known Member
^^ true ime ,my cob is relatively new,a 400w one...idk if its me or my mind,but it LOOKS like its lost a little brightness..
If so,oh well,it was an experiment..
Good luck!!
If so,oh well,it was an experiment..
Good luck!!
apoulin
Well-Known Member
I mean "enough" for a grow is pretty broad. What size space are you working with, how many plants? You can grow with only 50w, not sure how much you can yield from that. You figure absolute best case scenario 1g/w, 50w so ~50g if you are a pretty knowledgable grower. If you are not a seasoned grower than your yield will be substantially less, so I guess that depends on what you are trying to do.
I would recommend 2 cxa3070s @ ~50w a piece, that is what a lot of people are running on here and it is for a reason. Invest in those 2 cobs and a driver to run them and see how that works for you, but be warned once you start buying and assembling your own LEDs it becomes addicting lol
Another thing to consider is the spread of the light, one 100w LED will not be the same spread as 2 50w LEDs due to the fact the 2 COBs can be placed away from one another for greater canopy coverage.
stardustsailor
Well-Known Member
Look ..
At such low wattages ,thus low PPF (Photosynthetic Photon Flux) ,most plants ,even light-needy higher ones ,actually they do not make such efficient and/or great use of certain wls like the cyan-green-amber range ...
As the actual PPF of blue + red wls is relatively low ,there's no need for a "leash" to those wls.
No need for a signaling to "slow down" and of the so called "green-window" ,as when with high PPFs and/or larger sized plants ,where they are almost obligatory ...
So if you're planning on such low wattages ,my suggestion is not to use a white COB ,but
50 Watts of blue & red diodes .( example = 445 nm :470 nm :630 nm :660 nm at a radiant power ratio of about 1:1:8:2 ).
My guess is that the results of a monochromatic LED combo ,will outperform a single white COB driven so low .
Still,not that easy to acquire such LED fixture and at the same time to be of high quality.
Not many options around ..
Or ...
....Wait a minute ...
Your request is being processed ...
Check this out :
http://www.bonsaihero.com/index.php/ledgrow-led-panel-65-w
or
http://www.bonsaihero.com/index.php/ledgrow-led-panel-80-w
That's your best option ,at my humble opinion.
The quality of the light is exceptional ,the light is well tested and proven to yield usually over 1 gpw ,
and my guess is that you will be very -very satisfied from it .
White COBs are PAR (Photosynthetic Active Radiation ) sources of ~380-780 nm ,thus
they are really growth efficient at moderate to high PAR levels .Thus at greater electrical wattages.
Still,you can try a single, more powerful COB like the Bridgelux Vero 29 or the CXA / CXB 3590 ,dissipating 100 W ,if you're feelin' that weird " DIY itching " ...
But still ,if I was you I would go the Han's panel way ,for such low electrical wattage.
Worth of every pennie.
And that comes from a COB fanatic .
Cheers.
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bicit
Well-Known Member
You could, you would get far better results than say, a 150w HPS. Much better than T5, depending on the emitters you use.
The CXB3590 would be a beast, as would a pair of the new vero 29's. 3 CXB3590's in series@700ma would be even better still. Just depends on your budget and space.
The CXB3590 would be a beast, as would a pair of the new vero 29's. 3 CXB3590's in series@700ma would be even better still. Just depends on your budget and space.
stardustsailor
Well-Known Member
Sorry ,excuse me ...This is my current space :
Im trying to look at the best amount of light on a budget whilst staying cool. I have CFLs already, was just looking at other options
I 'm,usually stashin' my herb in such space ..
I was not having that in mind,postin' my answer ...
Gosh ,I give up ...
I really can't be much of a help ,in such case ..
Better use some pieces of LED strip..
Search for a high quality strip...
https://www.google.gr/search?q=led strip&source=lnms&tbm=isch&sa=X&ei=FnIMVeXeE6ar7AbG3ID4Bw&ved=0CAcQ_AUoAQ&biw=1280&bih=929
Bonus: No need for cooling ,active or passive ...
Cheers.
bicit
Well-Known Member
Do you have a picture of the inside? Or are you trying to grow in each individual drawer?This is my current space :
Im trying to look at the best amount of light on a budget whilst staying cool. I have CFLs already, was just looking at other options
apoulin
Well-Known Member
@ 50w each I can mount my LEDs about 12" from my canopy, they have a heatsink and cpu fan attached to the top (heatsink/fan ~5" tall). The fan adequately cools my heatsink, and should leave you some room depending on what you are growing in. I would add a fan for ventilation though for sure, LEDs run cooler but at the wattages you are talking in that small space the heat will probably be noticeable without additional ventilation.
churchhaze
Well-Known Member
5x cxb2530 3000k 80cri u2 bin. Would this 15" x 10x panel fit? (it's about 87.5W dissipated.. probably fine for that size box)
You could put it on HLG-120H-C500 and it would be about 58% loaded, which would still put the driver above 92% efficiency.
It would be great if HLG-80H-C and 60H-C had 500mA versions!!
You could put it on HLG-120H-C500 and it would be about 58% loaded, which would still put the driver above 92% efficiency.
It would be great if HLG-80H-C and 60H-C had 500mA versions!!
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churchhaze
Well-Known Member
I hope you plan on growing really short strains! 
apoulin
Well-Known Member
Put 2 3070s in thereI tried the drawers but failed
, get a vent fan and see what that box can do! Of course I am a little bias with the 3070, I am sure there are some cheaper LEDs that would work fine. Maybe the Vero 29, or some 18's given the space/cost restrictions?
apoulin
Well-Known Member
Maybe create an LST monster, short veg time I would assume lolI hope you plan on growing really short strains!
rosswaa
Well-Known Member
It's bigger than my last grow lol just keep it trainedI hope you plan on growing really short strains!
bicit
Well-Known Member
I'd go with the new vero 29's over the CXA 3070. pair each one with rosewill CPU cooler with a meanwell LPC-60-1400 and power the fans with a cell phone charger. 42% efficient, right around $100 to build. The vero line is a little more friendly to a first time DIY build.
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rosswaa
Well-Known Member
Only thing is finding the meanwell drivers in the UK. Had no luck as of yet.
For the veros what would the best temp to go for be I'm only going to be growing autos. These are my options http://www.digikey.co.uk/product-search/en?FV=ffecac20
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