Cxb3590 36v vs 72v pros and cons?

Getgrowingson

Getgrowingson

Well-Known Member
I am looking into ordering some cobs from kingbrite. I want to power each cob at ~50w. 4 per bar with three total to cover a 4x4 to 5x5 area. So 600w or so. I can get them at the same price. Which would you choose if you had a choice? Any pros cons you can come up with? Lower voltage drivers obviously but other then that is there anything to be gained by going with either one? Any comments welcome!
 
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churchhaze

Well-Known Member
The 36V version would allow you to put more in series for a given voltage.

the 72V version would draw less current per string.

If you wanted to use the HLG-185-Cxxx, you'd likely use the C1400 (143 for the 36V version and the C700 (300V) for the 72V version.
 
mc130p

mc130p

Well-Known Member
Resistive heat losses grow with the square of the current, so imho, I like to stay with 72V if I can... I can understand some people want the 32V for the reason Church listed though.
 
Getgrowingson

Getgrowingson

Well-Known Member
churchhaze said:
The 72V version has twice as many leds per string, but half the parallel strings.

The 36V version has half the leds per string, but twice as many parallel strings.
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Your talking about the LEDs inside of each cob in this post correct? If you were building this light which would you roll with? I suppose it doesn't matter much really because it will draw the same wattage either way. Unless drivers are cheaper for a lower current which I don't think is the case.
 
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churchhaze

Well-Known Member
Getgrowingson said:
Your talking about the LEDs inside of each cob in this post correct? If you were building this light which would you roll with? I suppose it doesn't matter much really because it will draw the same wattage either way. Unless drivers are cheaper for a lower current which I don't think is the case.
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Yes, I mean the individual leds as they're routed on the cob.

Given the selection of currently available drivers, the 72V version is probably better assuming you feel safe working with 285-400VDC.

If we had a hypothetical new 400W drivers that were both 285V and 1400mA, then the 36V version would begin to really shine.
 
Getgrowingson

Getgrowingson

Well-Known Member
churchhaze said:
Yes, I mean the individual leds as they're routed on the cob.

Given the selection of currently available drivers, the 72V version is probably better assuming you feel safe working with 300-400VDC.

If we had a hypothetical new 400W drivers that were both 300V and 1400mA, then the 36V version would begin to really shine.
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Gotcha thanks bro. I work with 400kv for my career so am totally comfortable. Need to respect voltage and current. Will end your life quickly given the right circumstances
 
Getgrowingson

Getgrowingson

Well-Known Member
[QUOTE="churchhaze said:
Yes, I mean the individual leds as they're routed on the cob.

Given the selection of currently available drivers, the 72V version is probably better assuming you feel safe working with 285-400VDC.

If we had a hypothetical new 400W drivers that were both 285V and 1400mA, then the 36V version would begin to really shine.
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Is there any drivers currently available that output 1050ma at 285v? All I can find is the hlg185-1050c and it seems it only goes up to 190v which seems to me I can only run 2 off of one driver which will cost me a small fortune in drivers. Also if I go the 700ma and want to out 4 on one driver simple math says I need 288v when the hlg185-700c maxes out at 286. Which seems to totally suck haha
 
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churchhaze

Well-Known Member
Getgrowingson said:
Is there any drivers currently available that output 1050ma at 285v? All I can find is the hlg185-1050c and it seems it only goes up to 190v which seems to me I can only run 2 off of one driver which will cost me a small fortune in drivers. Also if I go the 700ma and want to out 4 on one driver simple math says I need 288v when the hlg185-700c maxes out at 286. Which seems to totally suck haha
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Now you know our pain.. lol. there are so many almost perfect combinations, like 4x vero 29 on a hlg-185-1400 is short by a volt or 2.

Either way, I don't think 4 of them would actually add up to 288V at 700mA. I think that at 700mA, the forward voltage is less than 72V.
 
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bicit

bicit

Well-Known Member
Getgrowingson said:
Is there any drivers currently available that output 1050ma at 285v? All I can find is the hlg185-1050c and it seems it only goes up to 190v which seems to me I can only run 2 off of one driver which will cost me a small fortune in drivers. Also if I go the 700ma and want to out 4 on one driver simple math says I need 288v when the hlg185-700c maxes out at 286. Which seems to totally suck haha
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Should actually be around 71v. I'll test and see if 4 will fit on an HLG-185H-C700 later this afternoon. I just happen to have that exact combo :P
 
bicit

bicit

Well-Known Member
Getgrowingson said:
Did you ever end up giving this a shot?
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Yes, sorry about the delay. Didn't have time to sit down and test. However I finally got a chance. the HLG-185H-C700 is capable of running 4, 72v CXB3590's no problem. The HLG-120H-C1050 was able to run two with no problems as well.
 
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