• Here is a link to the full explanation: https://rollitup.org/t/welcome-back-did-you-try-turning-it-off-and-on-again.1104810/

2540 cree

Diskokobaja

Diskokobaja

Well-Known Member
i have an offer for that kind of diy light but i didnt find much info/grow log with it . I m a dumbass for diy and i Cant find good cheap led for 220$ with shipping and customs..
 
wietefras

wietefras

Well-Known Member
Diskokobaja said:
i didnt express myself correctly,i mean, is it much worse than 3070 cree?
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Yes it's much worse if you both run them at 50W

The 2540 is much smaller and you would need many more of those running at a much lower wattage to get comparable efficiency. From a quick glance on the datasheet I'd say 3 times as many 2540 COBs each running at a third of the wattage of the 3070.

You also need to look at the efficiency bin when comparing the two.
 
weed-whacker

weed-whacker

Well-Known Member
Diskokobaja said:
i will use it as side light

(3 cobs(2x3000k@50w plus 1x4000k@25w) for 190 euro including shipping. ))


.. i got 2 leds allready in my tent,i wanna better coverage.. So is it worth it?

it is that or http://bossledgrowlights.com/products/bestva-x5-new-led-grow-light-full-spectrum-grow-lights-led-for-plants-growing-and-flowering-led-grow-lights-for-indoor-plants
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I think that the 2540 will be much better, stephenJ is a seller and builder of lights and he agrees its not much worse.

efficency wise the 3000k 3070 is 45% and the 2540 is about 40% so its still good and for that price it's nice
 
wietefras

wietefras

Well-Known Member
weed-whacker said:
I think that the 2540 will be much better, stephenJ is a seller and builder of lights and he agrees its not much worse.
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He can agree that it is not much worse all he wants, but he clearly didn't read the opening post and therefore his answer is incorrect.

If you run both at 50W there is big difference in efficiency between CXB2540 and CXB3070. Smaller COBs need to be run at lower power to get equal efficiency.

Still, if 200 bucks is all you have and that burple fixture is your alternative then the 2540 fixture is possibly the better option.
 
Diskokobaja

Diskokobaja

Well-Known Member
wietefras said:
He can agree that it is not much worse all he wants, but he clearly didn't read the opening post and therefore his answer is incorrect.

If you run both at 50W there is big difference in efficiency between CXB2540 and CXB3070. Smaller COBs need to be run at lower power to get equal efficiency.

Still, if 200 bucks is all you have and that burple fixture is your alternative then the 2540 fixture is possibly the better option.
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yes its all moey that i have, and i dont have near good option as me.. Lets be honest i didnt find anything near that price.. and money is big issue for me now.. i will be halpuest person if tasty led,johnson led or timber led had eu store so i could buy real deal fixtures..
 
Stephenj37826

Stephenj37826

Well-Known Member
weed-whacker said:
I think that the 2540 will be much better, stephenJ is a seller and builder of lights and he agrees its not much worse.

efficency wise the 3000k 3070 is 45% and the 2540 is about 40% so its still good and for that price it's nice
Click to expand...

The key here is look for cxa2540 in 3000k if using single driver. Same bin as cxb2540 and can be found for sub $10 range
 
wietefras

wietefras

Well-Known Member
Diskokobaja said:
i will be halpuest person if tasty led,johnson led or timber led had eu store so i could buy real deal fixtures..
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Well you can try Todogrowled:
http://www.todogrowled.com/gb/

They have the "real deal" fixtures as well and are based in Spain. There also is Leoled (in Switzerland I think), but they are a lot more expensive. More refined too (nice modular system), but since you are on a budget not really an option. Think there also was one selling Cree COB fixtures in Italy, but I can't remember the name.

That CXB2540 fixture wouldn't be that bad either though. It's not going to break any records, but if those COBs are W2 bin you could get 127lm/W efficiency overall. Or for the V4 bin 120lm/W. Of course that's not 160lm/W like a CXB3070 could give you at 50W, but still. It would be 37% to 39% efficient and therefore a lot better than HPS and probably also better than that burple fixture.
 
weed-whacker

weed-whacker

Well-Known Member
wietefras said:
He can agree that it is not much worse all he wants, but he clearly didn't read the opening post and therefore his answer is incorrect.

If you run both at 50W there is big difference in efficiency between CXB2540 and CXB3070. Smaller COBs need to be run at lower power to get equal efficiency.

Still, if 200 bucks is all you have and that burple fixture is your alternative then the 2540 fixture is possibly the better option.
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no, I did read the OP post, and the efficiency I posted is from @SupraSPL 's spreadsheets (you can check yourself) when comparing top bin 3000k 3070 vs lowest bin 3000k 2540

perhaps you didn't understand that I am suggesting the 2540 will be better than the blurple
 
wietefras

wietefras

Well-Known Member
I didn't say you didn't read the OP. I'm saying Stephenj37826 probably replied to the second question only.

Or perhaps you both have a different definition of "much worse" from mine. I'd say 127lm/W (or more likely) 120lm/W is "much worse" than 160lm/W. Even though I agree that even at 120lm/W it's still better than HPS or a cheap burple (although it might be getting close).
 
Diskokobaja

Diskokobaja

Well-Known Member
wietefras said:
Well you can try Todogrowled:
http://www.todogrowled.com/gb/

They have the "real deal" fixtures as well and are based in Spain. There also is Leoled (in Switzerland I think), but they are a lot more expensive. More refined too (nice modular system), but since you are on a budget not really an option. Think there also was one selling Cree COB fixtures in Italy, but I can't remember the name.

That CXB2540 fixture wouldn't be that bad either though. It's not going to break any records, but if those COBs are W2 bin you could get 127lm/W efficiency overall. Or for the V4 bin 120lm/W. Of course that's not 160lm/W like a CXB3070 could give you at 50W, but still. It would be 37% to 39% efficient and therefore a lot better than HPS and probably also better than that burple fixture.
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I got their tgl 60 and one chinese customised led,so i wanna bulk up my coverage.. Currently money is big issue,and because my first led grow failed big time i wanna put some more light in it,coz seadling are allready in,in fact that diy led is only real option i got.. the tgl 220 is 420€, leo led is same price or even more expebsive,in italy there is spectra led or something similar and they are also very expence. i dont get those led eu fckn selers in eu.. if fckn tasty led is 390$ with 3590cobs why would you sell yours 3070 with same wattage for 700€??!! fcking duschebags.. i got some schoolgirls in my tent so i dont have time for saving money for pricier fixture.. i wanna put those DiY cobs side by side my chinese led.. http://www.spectradesignlab.com/store/p4/Spectra_REBEL_-_120_Watt_-_Luxeon_Rebel_-_v.1.0.html
420€!!! if that isnt insult to somebodys inteligence i dont know what is..
 

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