Cutter Electronics: Complete DIY COB kits

JorgeGonzales

JorgeGonzales

Well-Known Member
BobCajun said:
They do have single units available after all, just need to add your own HBG-60-1400. The 1400 is the only one that has the right voltage, from what I've seen. One such light would be good for one plant, flowered after minimal veg time. The reflector looks a little tight though, 24 degrees. Not sure what would be best for that, probably 60.
Click to expand...
I know, the problem is the pin heatsinks. How would you attach it? The HBGs seem designed for radial heatsinks, some of which already have mounting holes and hardware ready to go, Just don't see any obvious and inexpensive ones for the 3590, because they are huge.

If Mechatronix would do a 25mm high or so run of these, they'd be about equivalent to the kit sinks: http://www.led-heatsink.com/upload/files/ModuLED_Giga-HBG_Cree_XLamp_High_Bay_LED_Cooler_ø152mm_with_driver_connection_system.pdf

They do make a $15ish 50mm high version without HBG mounts, so it's not much of stretch, or particularly expensive. Just need to cut them shorter.
 
welight

welight

Well-Known Member
JorgeGonzales said:
I know, the problem is the pin heatsinks. How would you attach it? The HBGs seem designed for radial heatsinks, some of which already have mounting holes and hardware ready to go, Just don't see any obvious and inexpensive ones for the 3590, because they are huge.

If Mechatronix would do a 25mm high or so run of these, they'd be about equivalent to the kit sinks: http://www.led-heatsink.com/upload/files/ModuLED_Giga-HBG_Cree_XLamp_High_Bay_LED_Cooler_ø152mm_with_driver_connection_system.pdf

They do make a $15ish 50mm high version without HBG mounts, so it's not much of stretch, or particularly expensive. Just need to cut them shorter.
Click to expand...
I am pretty sure 25mm radial is not going to dissipate 50 watts and if you mount the HBG on top your power supply is likely to get smoky warm
Cheers
Mark
 
JorgeGonzales

JorgeGonzales

Well-Known Member
welight said:
I am pretty sure 25mm radial is not going to dissipate 50 watts and if you mount the HBG on top your power supply is likely to get smoky warm
Cheers
Mark
Click to expand...
The 20mm version is rated for 44W and 1.13 C/W. I just mentally added 25% to the height to match the 1.07 C/W thermal resistance of your kit heatsink.

Either way, my point wasn't my back of the napkin calculation, it was that they could just cut an existing extruded sink to a more appropriate length and it would be a nice all in one lamp for an underdriven CXB3590. Especially since you already have a relationship with them.

And all anybody would need is a screwdriver.
 
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BobCajun

BobCajun

Well-Known Member
JorgeGonzales said:
The 20mm version is rated for 44W and 1.13 C/W. I just mentally added 25% to the height to match the 1.07 C/W thermal resistance of your kit heatsink.

Either way, my point wasn't my back of the napkin calculation, it was that they could just cut an existing extruded sink to a more appropriate length and it would be a nice all in one lamp for an underdriven CXB3590. Especially since you already have a relationship with them.

And all anybody would need is a screwdriver.
Click to expand...
Apparently the 1400s can be adjusted down to about 950, so you'd have some leeway there. I would just position the driver somewhere other than on the heatsink. It just happens to be shaped so you could attach it if you wanted to, like to make a high bay.
 
JorgeGonzales

JorgeGonzales

Well-Known Member
BobCajun said:
Apparently the 1400s can be adjusted down to about 950, so you'd have some leeway there. I would just position the driver somewhere other than on the heatsink. It just happens to be shaped so you could attach it if you wanted to, like to make a high bay.
Click to expand...
The mounting hardware they sell leaves a substantial gap if I remember correctly, for cooling, so it's all designed to be slapped together. They even have a lens adapter thing that goes on the front.
 
nl5xsk1

nl5xsk1

Well-Known Member
So I have my cob kits, shipped on the 26th. and came today, wow! 3 days, and the packaging held up great, NOW time to play, more to come
 
EfficientWatt

EfficientWatt

Well-Known Member
@Growmau5 , @welight

Great work on those kits, nice price and config.

I'm sure it's an honest mistake from @Growmau5, and everyone has to make a buck somewhere ...
... but it does look like you are overselling those drivers ...

in your config/ad video for the DIY kit, you write the driver to have "94% efficiency" and...

... from Pairui's own datasheet, they only claim 90% typical efficiency at max load ...
(http://www.pairuigroup.com/upload/file/20160418/LGSU-250C.pdf)

It would be nice of you to rectify as that would be kind of false advertising now ...

Unless I missed something and you actually have a 94% efficienct version (?)

Keep up the good work

:peace:
 

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Growmau5

Growmau5

Well-Known Member
EfficientWatt said:
@Growmau5 , @welight

Great work on those kits, nice price and config.

I'm sure it's an honest mistake from @Growmau5, and everyone has to make a buck somewhere ...
... but it does look like you are overselling those drivers ...

in your config/ad video for the DIY kit, you write the driver to have "94% efficiency" and...

... from Pairui's own datasheet, they only claim 90% typical efficiency at max load ...
(http://www.pairuigroup.com/upload/file/20160418/LGSU-250C.pdf)

It would be nice of you to rectify as that would be kind of false advertising now ...

Unless I missed something and you actually have a 94% efficienct version (?)

Keep up the good work

:peace:
Click to expand...
hey man, thanks for keeping an eye out. and pointing out this possible discrepancy. I see what you are talking about and I will do some testing over the weekend at 220v ac in. and see what kind of juice this specific driver is pulling in and putting out. Ill document the testing and make the appropriate edits, if needed. I certainly am not out to mislead anyone. And just to be transparent.
I don't make a penny off the kits. Mark was very gracious to give me a full 4 cob kit as a thank you for endorsing the product and idea. I also purchased another 4 cob kit as well as two 1up kits at the same price as everyone else.

cheers
 

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BobCajun

BobCajun

Well-Known Member
EfficientWatt said:
@Growmau5 , @welight

Great work on those kits, nice price and config.

I'm sure it's an honest mistake from @Growmau5, and everyone has to make a buck somewhere ...
... but it does look like you are overselling those drivers ...

in your config/ad video for the DIY kit, you write the driver to have "94% efficiency" and...

... from Pairui's own datasheet, they only claim 90% typical efficiency at max load ...
(http://www.pairuigroup.com/upload/file/20160418/LGSU-250C.pdf)

It would be nice of you to rectify as that would be kind of false advertising now ...

Unless I missed something and you actually have a 94% efficienct version (?)

Keep up the good work

:peace:
Click to expand...
They have a Meanwell driver but it's out of stock. Very pricey though.
 
welight

welight

Well-Known Member
EfficientWatt said:
@Growmau5 , @welight

Great work on those kits, nice price and config.

I'm sure it's an honest mistake from @Growmau5, and everyone has to make a buck somewhere ...
... but it does look like you are overselling those drivers ...

in your config/ad video for the DIY kit, you write the driver to have "94% efficiency" and...

... from Pairui's own datasheet, they only claim 90% typical efficiency at max load ...
(http://www.pairuigroup.com/upload/file/20160418/LGSU-250C.pdf)

It would be nice of you to rectify as that would be kind of false advertising now ...

Unless I missed something and you actually have a 94% efficienct version (?)

Keep up the good work

:peace:
Click to expand...
Thats a fair comment. I will check this with Pairui and get a test report, if the supplies are not 94%, I will rectify the information we are producing to reflect the accurate information. I should point out our 400 watt supplies for the MAU5-VIII are tested before shipping to us and are certainly 94% at 220vac. Growmau is not in any way making a buck from us and information provided to him has come from us, so if inaccurate in any way the blame is with us not him
Cheers
Mark
 
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welight

welight

Well-Known Member
EfficientWatt said:
@Growmau5 , @welight

Great work on those kits, nice price and config.

I'm sure it's an honest mistake from @Growmau5, and everyone has to make a buck somewhere ...
... but it does look like you are overselling those drivers ...

in your config/ad video for the DIY kit, you write the driver to have "94% efficiency" and...

... from Pairui's own datasheet, they only claim 90% typical efficiency at max load ...
(http://www.pairuigroup.com/upload/file/20160418/LGSU-250C.pdf)

It would be nice of you to rectify as that would be kind of false advertising now ...

Unless I missed something and you actually have a 94% efficienct version (?)

Keep up the good work

:peace:
Click to expand...
I can reconfirm the Eff numbers on the base datasheet is typical/average. I have the test report if any one wishes to have a copy which confirms the units built and supplied to us are in fact 94.36% eff @220VAC
Cheers
Mark
 
anomolies

anomolies

Well-Known Member
Gonna hook up my lights together later today. The dc out on the 400w driver has a red and green wire, does the red wire (positive?) go into the negative of first cob?
 
P

PurpleBuz

Well-Known Member
anomolies said:
Gonna hook up my lights together later today. The dc out on the 400w driver has a red and green wire, does the red wire (positive?) go into the negative of first cob?
Click to expand...
are you sure one of the dc out is a green wire ? usually green is for ac ground ... but that's only a convention.
 
Growmau5

Growmau5

Well-Known Member
8 cob wiring diagram.png @EfficientWatt all good in the hood man.

@anomolies please take this as respectfully as possible. I am assuming you are quite new to this hobby. Please photograph the driver and post it here prior to your installation.

- the DC out that goes to the LEDs is red(+) black (-) for every driver I have ever seen on planet earth. The driver will say "DC out" written on the face of it the DC out(+) goes to the positive of the first cob in your series. here is a simple diagram.
 
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anomolies

anomolies

Well-Known Member
woops. i was gonna watch the vid again before installation so i would put the positive with positive :D. Completely new to LEDs and know nothing about wiring.

Oh, actually it's blue and not green (misjudged in low lighting).
so:
Output is Red / Blue
Input is Red / Blue / and this Green & Yellow wire (wtf)

edit: grumpytoker i think you're right, it is marked on the driver but i missed that. Apparently the red is supposed to be brown and +
 

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Growmau5

Growmau5

Well-Known Member
anomolies said:
woops. i was gonna watch the vid again before installation so i would put the positive with positive :D. Completely new to LEDs and know nothing about wiring.

Oh, actually it's blue and not green (misjudged in low lighting).
so:
Output is Red / Blue
Input is Red / Blue / and this Green & Yellow wire (wtf)

edit: grumpytoker i think you're right, it is marked on the driver but i missed that. Apparently the red is supposed to be brown and +
Click to expand...
8 cob driver wiring.jpg
 
P

PurpleBuz

Well-Known Member
anomolies said:
woops. i was gonna watch the vid again before installation so i would put the positive with positive :D. Completely new to LEDs and know nothing about wiring.

Oh, actually it's blue and not green (misjudged in low lighting).
so:
Output is Red / Blue
Input is Red / Blue / and this Green & Yellow wire (wtf)

edit: grumpytoker i think you're right, it is marked on the driver but i missed that. Apparently the red is supposed to be brown and +
Click to expand...
is that the pairui driver ? they seem to be oblivious to some wiring color code conventions.
 
L

ledsgrow2016

Member
Can anyone enlighten me as to how driver efficiency works when dimmed? I tried to make sense of the PF-P400CC-C140's datasheet (http://en.hzzhpower.com/upLoad/product/month_1601/PF-P400CC-Cxxx-S(U)-XX.pdf) but the graph on page 5 start's at 60%. What happens when dimmed down really low?

Is it a stupid idea to run eight 36V cobs at let's say 350mA, later on @700mA? I don't really plan on ever using them @1400, but maybe, who knows, some day I may, just because I can. ;-) I don't want to ruin the energy saving aspect of my LED panel (64% "light efficiency" - please forgive my poor choice of words - I can get @700mA (or even better @350mA) just because I made a bad choice on the driver...
 
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