Going commercial

[Airwalker16]

You can figure out the surface area for an inch of heatsink and multiply it by 6.45 to get cm/inch. Divide by 40 (using fans) or 120 (passive) to see how many watts of heat per inch the sink will dissipate. A 50w 3590 puts off 22 watts of heat and at 76 watts, about 38 watts of heat.

So with the 6.080 profile, it's .25 base plate but so are the fins height. Is the fins height super important for heat dissipation or more so the base?. If I only run 3-3590s on a 30" piece, would I be okay passively? Or would I need to add 2 fans on top where the spacing is between the middle and outside cobs? I can't understand the formula to figure it out. I know it's 116w/66W of heat though

 

[AquariusPanta]

What I'm saying is that if you are comparing the actual wattage to the expected wattage it would be a mistake to assume higher than expected wattage is waste. Have you been testing the current on the DC side? I've gotten between 102 and 105%. Never tested a HLG that used 100% or less. If you have examples of that I look forward to seeing the test results in one of your threads. I assume you don't use HLG drivers?



Split the AC to your drivers with a terminal block or some wago connectors. The 240-1750 has a higher current (thus wattage) than a 185-1400.

I use only MeanWell HLG drivers for cobs, for fans it's a different story. I have read and recorded both current and potential for multiple cobs at various outputs. Voltage was always typical for Vero when referencing to the datasheet (at set currents), with currents always being spot on for the HLG24042B, with the exception of tweaking the driver to push out, like you said, additional power (+100% rated current).

I'll attempt to piece together an excel sheet demonstrating this claim in the near future.

 

[Rahz]

So with the 6.080 profile, it's .25 base plate but so are the fins height. Is the fins height super important for heat dissipation or more so the base?. If I only run 3-3590s on a 30" piece, would I be okay passively? Or would I need to add 2 fans on top where the spacing is between the middle and outside cobs? I can't understand the formula to figure it out. I know it's 116w/66W of heat though

An inch of the 5.886 is 258 square centimeters and can dissipate about 2 watts passively and 6 watts with fans. 30" would work passively, but a few inches more wouldn't hurt. 30 would be plenty with fans.

 

[john0000]

whats a good spread on cxb 3590 at 1400ma..is 10 or 9 better ..trying to put 4 on one heatisnk

 

[Airwalker16]

@Rahz
Is it better to have the fNs blowing onto heatsink or pulling it off? And to run 2 12v 120mm fans on one wall cord, do I just need an apv 12-24? And also, do you think it'd be any different in performance if I used cutters Pairui drivers rather than meanwells?

 

[Fastslappy]

Is it better to have the fNs blowing onto heatsink or pulling it off?

blowing down into the fins is best IIRC (turbulence in the fin area is wanted )

 

[Fastslappy]

how far would you space out (on center ) if you were doing bar builds of 3590's ? ?



the bars will make an array but I want flexibly to group closer & /or wider


I want over kill & be able to grow tall sativa types

my gro area 5 x 6 foot with a 8 foot ceiling (2nd bath ) shower stall & sink gone
grew tall sativa types in there last winter under mars2 they got 5-6 foot plants w/ huge buds
but I did have near 2K watts (real) in mars2 outta the wall watts on the last 4 weeks
did I say overkill is my middle name ?

 

[Rahz]

You already have an idea of PPFD / par watts per foot, so I would try to split them up for optimal distribution in whatever grid worked best. It could be a good idea to give some extra space around the outer edge. For instance, if you can space the cobs every 9 inches and leave 12-14 inches between the outer cobs and the walls that would work well. This would also be based on how high you plan to hang the lights... the higher the lights will be above the canopy the more centralized you would want the array.

how far would you space out (on center ) if you were doing bar builds of 3590's ? ?



the bars will make an array but I want flexibly to group closer & /or wider


I want over kill & be able to grow tall sativa types

my gro area 5 x 6 foot with a 8 foot ceiling (2nd bath ) shower stall & sink gone
grew tall sativa types in there last winter under mars2 they got 5-6 foot plants w/ huge buds
but I did have near 2K watts (real) in mars2 outta the wall watts on the last 4 weeks
did I say overkill is my middle name ?

 

[Fastslappy]

This would also be based on how high you plan to hang the lights... the higher the lights will be above the canopy the more centralized you would want the array.

I forgot about that spread
what about cobs slightly angled toward the Center @ the point where the wall & ceiling meet ??
OR @ the end of a bar ? angled slightly in center

 

[Rahz]

I think the center is going to have the highest intensity anyway so wouldn't recommend the outer emitters angle in.

 

[Airwalker16]

@Rahz
I guess my questions got lost?

 

[Abiqua]

@Rahz
I guess my questions got lost?

fans blow down onto heatsinks : Yes
2 watts passive Per every Inch of 6" heatsink....

30 inches = 60 watts.

 

[Airwalker16]

There's an entire second question, friend.

 

[Airwalker16]

fans blow down onto heatsinks : Yes
2 watts passive Per every Inch of 6" heatsink....

30 inches = 60 watts.

Your way is so much easier to understand for me! Haha. That's really how much space it needs? That's a ton. Are you sure that's applied to that particular profile though? The baseplate is 1/4"(which I know is more than sufficient) but a 1/4" as well as the fin height. It's not like most profiles with inch long fins

 

[Fastslappy]

I think the center is going to have the highest intensity anyway so wouldn't recommend the outer emitters angle in.

yeah I was running that image in my mind & thought Too hot in the center
better to stagger each cob mount on the bars differently every 2 times across the room
ThanX big time

 

[nogod_]

The 2w/inch figure is heat watts not total watts. The more efficient your setup, the less sink you need. If you have 200w of 55% efficient cobs on a bar, then you need enough heatsink to deal with 90w of heat, not 200w.

90w/2 = 45" x 5.886" to cool that setup

Your way is so much easier to understand for me! Haha. That's really how much space it needs? That's a ton. Are you sure that's applied to that particular profile though? The baseplate is 1/4"(which I know is more than sufficient) but a 1/4" as well as the fin height. It's not like most profiles with inch long fins

 

[Rahz]

There's an entire second question, friend.

Fastslappy addressed it, same thing I would tell you.

 

[john0000]

my order is in (12) cxb 3590 cd 3500k. (3) hlg 185h c1400a (3) heatsinkusa 42'' 5.886..gonna run it passive with 4 cobs on each 9.5 inches apart..got 18 gauge solid wire ..wago 5 conductor compact conductors,#4-40 thread screw.thermal paste..anything I'm missing bc all that is on way

 

[Airwalker16]

Fastslappy addressed it, same thing I would tell you.

Dude... I'm talking about running 2 FANS. With 1 driver on the same wall plug as the other 2 heats inks will be on. So do I just need the apv 12-24 instead of running 2 12-12's, one for each fan? Do is just wire both fans to the account leads along with the cob driver? Then once that's done on all 3, wire all 3 together?

Is this is drawing what I need to do? This is an example of wiring 2 heatsinks components together. 2 fan drivers (small box) and 2 cob drivers (big box). I'll have 3 of each when I actually do it though. Is this correct wiring?

 

[Airwalker16]

@Rahz
One more thing, how do I dim all 3 B drivers simultaneously with one potentiometer?
Also, if I wanna run 3cxb3590 (36v) @ 2100mas, do I need the 240-2100b? Because it's total output is 119V and 36x3=108V. So it's close. Because the 185 doesn't have a 1750 option, I can't even efficiently run 3 cobs on it at 1400 right? That has to be done on a 120-1400 but only gives me 52w each cob. 240-2100 is 76-78wattz. Is there any way I can run 3 at 1750 to get 64ish watts??