LED FAQ) Building and DIY

[jikko77]

sooooooo, i've turned the lights out.

since all this started here, after have read this thread, i wanna share what i've put to dry:

medium: soil.
watt: 150w
cree cob: 3x cxb 3070 3000°k AD drive at 1400mA max
area used: 60*60cm with a scrog for each, 11l pot

the weight is in grams, and still need to dry out:

s.s:

b.k.2#1:

b.k.2#3:

 

[Koondense]

Good looking harvest jikko!
Please inform us with the final dry weight(no branches), I'm really intrerested in your numbers

ive always wondered if we would be better off running a CXB3590s worth of dollars in these at the same watts

eg a cxb3590 costa bout $50 and we would run it at 50w


how about 25 of these 100w cobs each run at 2w? what woudl the efficency be like?


http://www.aliexpress.com/item/High...10&btsid=132d6312-72fe-4466-8aa3-d46b7c823958

I was thinking the same thing(before building my lights) but always ended believing this option wouldn't be so good for general application. Basically there is a lot of surface(LES) @ low current, meaning not much total photons from each LES, giving out a low intensity light, probably good for seedlings and young plants.
For example stacking lots of 10W cobs powered with 2W we'd need a 5x5 cobs panel for a 50W total output.
If one 10W cob's LES is 1cm^2(I see now it's actually (11,5mm)^2), we have 25cm^2 vs. one cxb3590 with 9,4cm^2 LES.
In the end it still could be used for good growing, just depends on the application.

 

[Dion]

Good looking harvest jikko!
Please inform us with the final dry weight(no branches), I'm really intrerested in your numbers




I was thinking the same thing(before building my lights) but always ended believing this option wouldn't be so good for general application. Basically there is a lot of surface(LES) @ low current, meaning not much total photons from each LES, giving out a low intensity light, probably good for seedlings and young plants.
For example stacking lots of 10W cobs powered with 2W we'd need a 5x5 cobs panel for a 50W total output.
If one 10W cob's LES is 1cm^2(I see now it's actually (11,5mm)^2), we have 25cm^2 vs. one cxb3590 with 9,4cm^2 LES.
In the end it still could be used for good growing, just depends on the application.

that and the batching wouldnt be consistant

BTW cree is going the way of the dodo bird, hello citizen


@jikko77

is that 370g wet? I look forward to seeing the dry wieght but should be around 120g no?

 

[jikko77]

dry wieght but should be around 120g no?

something like that, i hope.

 

[Mr Celsius]

that and the batching wouldnt be consistant

BTW cree is going the way of the dodo bird, hello citizen


@jikko77

is that 370g wet? I look forward to seeing the dry wieght but should be around 120g no?

I also saw those charts, but am on the fence. You will have less even distribution of light and may have to implement further optics. It's definitely appealing to think of spending less for the same PPFD. I worry a little about the cooling requirements and effects on efficiency when running these higher wattage COBs. Also excited though. Definitely keep me in the loop with any info you have on them. Thanks

 

[Dion]

I also saw those charts, but am on the fence. You will have less even distribution of light and may have to implement further optics. It's definitely appealing to think of spending less for the same PPFD. I worry a little about the cooling requirements and effects on efficiency when running these higher wattage COBs. Also excited though. Definitely keep me in the loop with any info you have on them. Thanks

the only advantage of using cree now is if u had to do it for a comercial application where all the lights need to be the exact same

ie in the lobby of a hotel, so you would take cree because its binned for specific colour and brightness

however if cree gives 170L per watt for top bin and citizen gives 180-195L per watt id take citizen anyday

you can search around the web there are plenty ppl doing pulsed measurments with par meaters on these new cobs

especially consider they are 300w cobs that cost the same as a CXB3590

so when we run them at 70w we get very nice efficency

 

[jikko77]

dry weight:



this day are too hot, it dried to fast imho, moved in glass jar with boveda 62.

 

[Xickle]

So I have a few questions, if somebody could please help:

I'm planning on building a DIY LED light for a 60x70cm closet (4,2m2 or 4,5ft2). Would 3 Cree COBs be enough for such a small space? And should they all be 3500K?

EDIT: now that cree has released the 3500K in BB bin that is the way to go for the cxb3070 however with the release of the hld 240(meanwell driver) especially the 1750mA the 3590 is actually cheaper to use(if u calculate total sytem costs)

Does this mean if I choose to buy CXB, I should go for the 3590?

 

[Koondense]

...(4,2m2 or 4,5ft2)...

Ten times less actually, it's 0,42m^2.
Two-three cobs will be fine, you will need around 150W total for that space.
CXB3590 is the best option so far, if you have enough money.

 

[Dion]

So I have a few questions, if somebody could please help:

I'm planning on building a DIY LED light for a 60x70cm closet (4,2m2 or 4,5ft2). Would 3 Cree COBs be enough for such a small space? And should they all be 3500K?

Does this mean if I choose to buy CXB, I should go for the 3590?

yes and yes BUT you should look into
http://ce.citizen.co.jp/productse/info.php?no=107

if u can find the at your location, they are ahead of CXB3590 and cost half, plus u dont need cob holders for them

two of these at 75w each would be perfect
http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_5/CLU058-1825C4_P3712_0516.pdf

3500K is perfect, 3000 or 4000 will be fine also

also seen as you are using cm I assume you are running on 240v ac?

then look into the ELG-150 meanwell driver

 

[Dion]

dry weight:

[URL=https://www.icmag.com/ic/picture.php?albumid=65971&pictureid=1620539&thumb=1]View Image[/url] [URL=https://www.icmag.com/ic/picture.php?albumid=65971&pictureid=1620538&thumb=1]View Image[/url]

this day are too hot, it dried to fast imho, moved in glass jar with boveda 62.

so about 114g dry?
.76g per watt?
was that ur first grow?
how is that compared to usual?


buds look rock hard, well done

 

[GDSBurns]

yes and yes BUT you should look into
http://ce.citizen.co.jp/productse/info.php?no=107

if u can find the at your location, they are ahead of CXB3590 and cost half, plus u dont need cob holders for them

two of these at 75w each would be perfect
http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_5/CLU058-1825C4_P3712_0516.pdf

3500K is perfect, 3000 or 4000 will be fine also

also seen as you are using cm I assume you are running on 240v ac?

then look into the ELG-150 meanwell driver

So how do you mount these if cob holders aren't required?

 

[Xickle]

yes and yes BUT you should look into
http://ce.citizen.co.jp/productse/info.php?no=107

if u can find the at your location, they are ahead of CXB3590 and cost half, plus u dont need cob holders for them

two of these at 75w each would be perfect
http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_5/CLU058-1825C4_P3712_0516.pdf

3500K is perfect, 3000 or 4000 will be fine also

also seen as you are using cm I assume you are running on 240v ac?

then look into the ELG-150 meanwell driver

Thanks for the reply and suggestions!

I've spent about an hour and a half looking for Citizen COBs sold in Europe, but sadly I found very little sellers, and none that ship outside of their country. Could you suggest any other alternatives that I could try and find?

 

[Dion]

Thanks for the reply and suggestions!

I've spent about an hour and a half looking for Citizen COBs sold in Europe, but sadly I found very little sellers, and none that ship outside of their country. Could you suggest any other alternatives that I could try and find?

http://www.tme.eu/

also u can get drivers there
even heatsinks or
heatsinks use the cpu cooler u can find local

use sheet iron screws(they r self tapping)



i can look into it a biit if u like

I only found these
http://www.tme.eu/en/details/clu048-1818c430al7/white-power-leds-cob/citizen/clu048-1818c4-30al7k3/

http://www.tme.eu/en/katalog/#search=CLU048-1212&s_field=accuracy&s_order=DESC

with a quick look, havnt done the maths on those models yet

http://www.digikey.at/product-detail/en/citizen/CLU058-1825C4-353M2K1/1642-1338-ND/5973722

this is the one you want that is better than a cxb3590 at 50w when you run it at 70w

 

[Xickle]

http://www.tme.eu/

also u can get drivers there
even heatsinks or
heatsinks use the cpu cooler u can find local

use sheet iron screws(they r self tapping)



i can look into it a biit if u like

I only found these
http://www.tme.eu/en/details/clu048-1818c430al7/white-power-leds-cob/citizen/clu048-1818c4-30al7k3/

http://www.tme.eu/en/katalog/#search=CLU048-1212&s_field=accuracy&s_order=DESC

with a quick look, havnt done the maths on those models yet

http://www.digikey.at/product-detail/en/citizen/CLU058-1825C4-353M2K1/1642-1338-ND/5973722

this is the one you want that is better than a cxb3590 at 50w when you run it at 70w

I appreciate the effort! I've found those sites before, but unfortunately they don't ship any of the Citizen COBs to my country(Slovenia). I've checked mouser.com, and it looks like they ship here, but they don't sell Citizen COBs. Are there any alternatives that might be on that site?

 

[Mr Celsius]

Are citizen really worth the money? They are only slight more efficient, in theory, to a CXB3590 and seem more expensive in the US. Maybe someone can explain?

 

[Dion]

Are citizen really worth the money? They are only slight more efficient, in theory, to a CXB3590 and seem more expensive in the US. Maybe someone can explain?

some of them are

for example the 1825 is about 20% more efficent at 50w vs a cxb3590 and about the same when run at 70w

so if u run them at 70w ur $ per watt increase while in reality they cost about the same/a little less than cxb3590

plus if u dont plant to use optics as many of us dont then u dont need to use cob holder, teh cobs have holes and can be mounted with a m3 screw directly to the heatsink


https://www.cdiweb.com/FeaturedProducts.aspx?type=11131&manf=3039&cate=3039:57&NavType=2&sd=false


this one for example

https://www.cdiweb.com/ProductDetail/CLU0581825C4273H5K2-Citizen-Electronics-Co-Ltd/590999/



I think its just a touch too early to find this gen 5 citizen at cheap prices perhaps in a few months


etc

https://www.cdiweb.com/ProductDetail/CLU0581825C450AL7K3-Citizen-Electronics-Co-Ltd/591009/

 

[Dion]

I appreciate the effort! I've found those sites before, but unfortunately they don't ship any of the Citizen COBs to my country(Slovenia). I've checked mouser.com, and it looks like they ship here, but they don't sell Citizen COBs. Are there any alternatives that might be on that site?

really?

Stroški pošiljanja paketa do 30 kg z letalskim prevozom UPS Express Saver znašajo 7,90 evra (neto). Čas dostave – 1 dan (v primeru oddaje naročila do 15. ure po varšavskem času).
Nevarnega blaga, kot so npr. eksplozivi, vnetljive snovi, plini itn., ni možno pošiljati preko UPS Express Saver.


http://www.tme.eu/en/HowBuy/6/Country:HowToBuy-way-and-costs-of-transport-112.html


EDIT: ok i logged in tried to order and see u r right sorry

u can just email jerry and get the cxb3590, he has drivers and heatsinks as well as reflectors and holders, its a 1 stop shop
probably the easier option


edit #2:
if u really want to you can use the cxa2530 from fast tech like growmau5 did

https://www.youtube.com/watch?v=emIAgXxjTE0


take a ELG-150-C500 and put 8 of the cxa on it you will still have room for 8 or so red monos if u decide u want to(but you dont need it)

you can even take the heat sinks from there too

https://www.fasttech.com/product/2250000

https://www.fasttech.com/product/1348407

http://www.aliexpress.com/item/Free..._3&btsid=da431f24-72af-44e9-a1ba-6c9b2246b1dd

 

[Xickle]

really?

Stroški pošiljanja paketa do 30 kg z letalskim prevozom UPS Express Saver znašajo 7,90 evra (neto). Čas dostave – 1 dan (v primeru oddaje naročila do 15. ure po varšavskem času).
Nevarnega blaga, kot so npr. eksplozivi, vnetljive snovi, plini itn., ni možno pošiljati preko UPS Express Saver.


http://www.tme.eu/en/HowBuy/6/Country:HowToBuy-way-and-costs-of-transport-112.html


EDIT: ok i logged in tried to order and see u r right sorry

u can just email jerry and get the cxb3590, he has drivers and heatsinks as well as reflectors and holders, its a 1 stop shop
probably the easier option

Yeh they really trick you into thinking that you'll be able to buy them until you register, and it tells you they don't ship to your country

I've decided to just buy from eu.mouser.com, as they are also in the EU, which means I don't need to pay extra for any import tax and customs.
I'd either go for 2x CXB3590 and 1x MeanWell ELG-150-C1400A or 3x CXB3070 with the same driver. I'll also add some holders and an active heatsink, which I haven't picked yet.

I've picked both 36V COBs from their highest bins, so they should be able to give enough light to two plants. The cost is about the same, but have you got an opinion on which package is best?

 

[Dion]

Yeh they really trick you into thinking that you'll be able to buy them until you register, and it tells you they don't ship to your country

I've decided to just buy from eu.mouser.com, as they are also in the EU, which means I don't need to pay extra for any import tax and customs.
I'd either go for 2x CXB3590 and 1x MeanWell ELG-150-C1400A or 3x CXB3070 with the same driver. I'll also add some holders and an active heatsink, which I haven't picked yet.

I've picked both 36V COBs from their highest bins, so they should be able to give enough light to two plants. The cost is about the same, but have you got an opinion on which package is best?

mouser will charge you VAT at checkout

if u are set on mouser consider that 3 of the 3070 on that driver is your cheapest best option it will give u a lot more light than 2 of the 3590

in ur 60x70
3x3070=150w=759ppfd
2x3590=100w=550ppfd aka shit
3x3590=150w=840ppfd


3070x3 is ur best option dude


or I suggest to get the B version dimming not A also

http://eu.mouser.com/ProductDetail/...5PRBMPTWcaZHCrgNWzuwCgvul17Yhc4SR7bxBQ1QJjg==


use
http://eu.mouser.com/ProductDetail/...C15B100K/?qs=sGAEpiMZZMv3em63uDEI/GTMqIeeNcxt

to dim


unfortunantly mouser only has the TE connectivity cob holder things and they r a bitch to work with

i have 4 of the plastic kind but you will need to solder, if u want i can mail those to you

have you looked at cutter though? they have the best prices, i still had to pay VAT when i recieved the package from them but i think that is where you should try first

(just go to check out in mouser and you will see the VAT)


http://www.cutter.com.au/proddetail.php?prod=cut2965

or take these(36euro with heatsink come on)
http://www.cutter.com.au/proddetail.php?prod=cut2901

http://www.cutter.com.au/proddetail.php?prod=cut2905

http://www.cutter.com.au/proddetail.php?prod=cut2792

http://www.cutter.com.au/proddetail.php?prod=cut2860

use the code CUTANDROLL for a discount(10%?)