Cree cxb3590 lens help

Stephenj37826

Stephenj37826

Well-Known Member
I have jerry looking into already. It basically doubles the price of the lenses and moq is 500 pieces. Still considering going ahead with it. Low iron glass would be nice. Sure would like to see the cxb series 3500k put under a radiospectrometer.
 
alesh

alesh

Well-Known Member
SupraSPL said:
Yep Anti Reflecive coating is what we are after. If done correctly it should reduce the lens losses from 10% to about 2-3%. If we can get lenses with low iron glass that could reduce lens losses to 1% (allegedly). It would be relatively easy to verify the actual gains by testing with PAR meter or lux meter. When I order glasses from Zenni they offer AR coating for an extra $5 and it does make a noticeable difference when compared with glasses that do not have AR coating.
Click to expand...
That and a horticulture-friendly beam pattern. Some kind of batwing pattern would be best IMO. Something like this (Y-Y; dashed line).
 
alesh

alesh

Well-Known Member
Nappy420 said:
No then u will need double the cobs for that doing it that way ur 64% effcient doing the c1400 at 1.4 amps is 56 efficent or so still not to far off and half the cobs
Click to expand...
72V version of 3000K/80CRI CB is about 40% efficient at 1.4A.
 
N

Nappy420

Member
alesh said:
72V version of 3000K/80CRI CB is about 40% efficient at 1.4A.
Click to expand...
lets see, a 7x7 , or 49 square feet. I'll use supraspl's calculations and adapt them the best I can.

@ 56.3%
(4) CXB3590 3500K CD 36V @ 1.4A (49W ea) 110.3 PAR W covering 6ft² = 824 PPFD

@64%
(8 ) CXB3590 3500K CD @ 700mA (23W ea) 117.8 PAR W covering 6ft² = 879 PPFD

900-1000 ppfd is maxing things out pretty hard. especially because we arent talking about a 900ppfd hot spot here, we are talking about blasting some serious light evenly and uniformly across the entire space. Its going to be expensive to do this many 3590s. Even at 1400mA, you are looking at investing about $2500 for everything. To do a (64) cob setup @ 700mA you will be spending almost $5k
 
alesh

alesh

Well-Known Member
Nappy420 said:
lets see, a 7x7 , or 49 square feet. I'll use supraspl's calculations and adapt them the best I can.

@ 56.3%
(4) CXB3590 3500K CD 36V @ 1.4A (49W ea) 110.3 PAR W covering 6ft² = 824 PPFD

@64%
(8 ) CXB3590 3500K CD @ 700mA (23W ea) 117.8 PAR W covering 6ft² = 879 PPFD

900-1000 ppfd is maxing things out pretty hard. especially because we arent talking about a 900ppfd hot spot here, we are talking about blasting some serious light evenly and uniformly across the entire space. Its going to be expensive to do this many 3590s. Even at 1400mA, you are looking at investing about $2500 for everything. To do a (64) cob setup @ 700mA you will be spending almost $5k
Click to expand...
72V version ffs. You're referring to 36V ones.
 
N

Nappy420

Member
I just dont see how the the cxb3590 cd 72v is only 40% efficient when the 36v is over 50% when to me if im running 240 it should make it more efficent
 
alesh

alesh

Well-Known Member
Nappy420 said:
I just dont see how the the cxb3590 cd 72v is only 40% efficient when the 36v is over 50% when to me if im running 240 it should make it more efficent
Click to expand...
Your mains voltage doesn't affect COB's efficiency at all.
72V version dissipates about 105W @1.4A while the 36V version dissipates only 49W at 1.4A. It's running much harder that's why it's less efficient.
CB is 40%, CD is about 43%. 72V version at 1.4A.
 
N

Nappy420

Member
@ 56.3%
(4) CXB3590 3500K CD 36V @ 1.4A (49W ea) 110.3 PAR W covering 6ft² = 824 PPFD
How is that at 56.3 then
 
alesh

alesh

Well-Known Member
Nappy420 said:
Im not sure yet thats y im doing research and asking question i have 240 in the room and 120 but u said the v dont effect effiecence so how does it matter if i use 240 or 120?
Click to expand...
It doesn't gosh.
And it doesn't matter whether you use 36V or 72V version.
Just get the HLG-185H-C700 for (4) 72V CXB3590 or HLG-185H-C1400 for (4) 36V CXB3590.

Some people are really difficult to talk to.
 
N

Nappy420

Member
Not trying to be difficult trying to learn ur telling me one thing and after all my research i found something else so im asking u to explain ur self thats it i have this stuff staying 56 efficint and ur saying 43 at best im just asking for u to explain y u get those numbers
 
alesh

alesh

Well-Known Member
Nappy420 said:
Not trying to be difficult trying to learn ur telling me one thing and after all my research i found something else so im asking u to explain ur self thats it i have this stuff staying 56 efficint and ur saying 43 at best im just asking for u to explain y u get those numbers
Click to expand...
OK, I see you're quite lost in it.

So there are two versions of CXB3590 - 72V and 36V
They have the same number of dies but the 72V version has half as many series strings twice as long. The performance is exactly the same.
The 72V version has maximum current 1.8A while 36V has Imax 3.6A. But since the 72V version has double the voltage the absolute maximum power is the same.

Now the 36V 3500K CD really is about 56% efficient at 1.4A, dissipating ~49W and delivering ~128 µmol/s.
The 72V 3500K CD is about 56% efficient at 0.7A, dissipating ~49W and delivering ~128 µmol/s. At 1.4A the 72V version is 43% efficient, dissipating ~104W and delivering ~208 µmol/s.

Can you see why you were suggested to use .7A driver with the 72V version now? And why that's almost the same setup as 36V at 1.4A?
 
N

Nappy420

Member
thanks and ya its making sence to me this is where im getting lost at ... it dosnt really matter if i run 240 or 120 its all the same? also with the 72v can i run it on a 120 system or should i get he 36v i have an order in for the 76v cause i was ing to run it on my 240 system but it seems easir to run it on my 120 and get the same numbers driver is the hlg185 c1400 i allready have it so not going to change that with the cxb3590
 
N

Nappy420

Member
Nappy420 said:
thanks and ya its making sence to me this is where im getting lost at ... it dosnt really matter if i run 240 or 120 its all the same? also wtith the 72v can i run it on a 120 system or should i get he 36v i have an order in for the 76v cause i was ing to run it on my 240 system but it seems easir to run it on my 120 and get the same numbers driver is the hlg185 c1400 i allready have it so not going to change that with the cxb3590
Click to expand...
also i am put a pot knob on there also so i can control the amp on it
 
alesh

alesh

Well-Known Member
Nappy420 said:
thanks and ya its making sence to me this is where im getting lost at ... it dosnt really matter if i run 240 or 120 its all the same? also with the 72v can i run it on a 120 system or should i get he 36v i have an order in for the 76v cause i was ing to run it on my 240 system but it seems easir to run it on my 120 and get the same numbers driver is the hlg185 c1400 i allready have it so not going to change that with the cxb3590
Click to expand...
Mains voltage slightly affects the driver's efficiency - 93% off 120V and 94% off 240V. But it has nothing to do with COBs' efficiency and affects both 0.7A and 1.4A drivers in the same way.

Just remember -
HLG-185H-C1400 for 4 36V 3590s
HLG-185H-C700 for 4 72V 3590s
the result is exactly the same - same efficiency, same dissipation.

Make sure you get the B version of the driver if you want to hook up a pot on it.

e: @robincnn beat me there:)
The chart is valid but the prices might have changed.
 
N

Nappy420

Member
alesh said:
Mains voltage slightly affects the driver's efficiency - 93% off 120V and 94% off 240V. But it has nothing to do with COBs' efficiency and affects both 0.7A and 1.4A drivers in the same way.

Just remember -
HLG-185H-C1400 for 4 36V 3590s
HLG-185H-C700 for 4 72V 3590s
the result is exactly the same - same efficiency, same dissipation.

Make sure you get the B version of the driver if you want to hook up a pot on it.

e: @robincnn beat me there:)
The chart is valid but the prices might have changed.
Click to expand...
thank u for ur help understanding better
 
G

grow001

New Member
guy, what can i use for protect the cob(cxb3590)? The cobs are so close to the plants , i dont need expand the area covered. Just protect them. Lens with 90º ?
 
You must log in or register to reply here.
Top