Cutter Electronics: Complete DIY COB kits

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Freezy_

Active Member
Okay,

I just went through and read a lot of this thread that I did not read before... my bad. I think that kit is mint and I am going to order a few of them. Def considering going with a 4 x 6 area now to keep the cost down a little. If I order 6 of the kits for a 4x6 that's enough for one led for every sq foot...Is this going to be enough light? Should I mix up the spectrum at all? Growmau seems to suggest in his videos that the 3500k is really all you need... This 4 x 6 area is going to be just for flowering! Also, are the reflectors in the kit better than the glass ones growmau uses on his fixture? If I was to add some more LED's to this, what are the red ones that growmau uses (the ones he leaves on for 10 minutes before lights out). Is there a noticeable difference when using these? I'm pumped about these lights and that i get to build a whole new room from scratch. My question still stands about the AC though. will a 12,000 btu mini split be okay? Its a sealed room with co2.

Thank you guys for all the really great open source info here. I was skeptic about the leds and growmau comin in with the 1.7/1.9 gpw was enough proof for me that cob's are the way to go.
 
Airwalker16

Airwalker16

Well-Known Member
Freezy_ said:
Okay,

I just went through and read a lot of this thread that I did not read before... my bad. I think that kit is mint and I am going to order a few of them. Def considering going with a 4 x 6 area now to keep the cost down a little. If I order 6 of the kits for a 4x6 that's enough for one led for every sq foot...Is this going to be enough light? Should I mix up the spectrum at all? Growmau seems to suggest in his videos that the 3500k is really all you need... This 4 x 6 area is going to be just for flowering! Also, are the reflectors in the kit better than the glass ones growmau uses on his fixture? If I was to add some more LED's to this, what are the red ones that growmau uses (the ones he leaves on for 10 minutes before lights out). Is there a noticeable difference when using these? I'm pumped about these lights and that i get to build a whole new room from scratch. My question still stands about the AC though. will a 12,000 btu mini split be okay? Its a sealed room with co2.

Thank you guys for all the really great open source info here. I was skeptic about the leds and growmau comin in with the 1.7/1.9 gpw was enough proof for me that cob's are the way to go.
Click to expand...
One per sq foot at the kits 50w ec is MORE than enough. Good thing the drivers dim. But if you wanna mix spectrums at all, get mostly 3500k as you thought and add just some 3k & 4k with it is all.
 
Growmau5

Growmau5

Well-Known Member
Freezy_ said:
Okay,

I just went through and read a lot of this thread that I did not read before... my bad. I think that kit is mint and I am going to order a few of them. Def considering going with a 4 x 6 area now to keep the cost down a little. If I order 6 of the kits for a 4x6 that's enough for one led for every sq foot...Is this going to be enough light? Should I mix up the spectrum at all? Growmau seems to suggest in his videos that the 3500k is really all you need... This 4 x 6 area is going to be just for flowering! Also, are the reflectors in the kit better than the glass ones growmau uses on his fixture? If I was to add some more LED's to this, what are the red ones that growmau uses (the ones he leaves on for 10 minutes before lights out). Is there a noticeable difference when using these? I'm pumped about these lights and that i get to build a whole new room from scratch. My question still stands about the AC though. will a 12,000 btu mini split be okay? Its a sealed room with co2.

Thank you guys for all the really great open source info here. I was skeptic about the leds and growmau comin in with the 1.7/1.9 gpw was enough proof for me that cob's are the way to go.
Click to expand...
hey bud, welcome.
Six x (4) cob kits is going to be plenty of light. you will probably end up dimming a little.
-the glass lenses and the ledil Angelina have very similar performance. there are advantages and disadvantages to both, but as far as the plants are concerned, they are comparable.
-the 730-740nm far red leds is what some people use for 5-10mins at lights out. and it works. strain dependant, you could shave a few days off your flowering time, or use them to increase the duration of your photoperiod from 12/12 to 13/11 or even 14/10. for more details on those techniques, check out "The Far Red Thread"
-a 12000 btu dual hose portable AC unit will handle 2700-3000 watts of wall dissipation from your COB leds plus all the other appliances in your room (dehumidifier, fans, air pumps, etc). in a sealed room when its 100F outside maximum. I tried this last summer and that was the max of my 12000 btu unit & it ran for almost the entire 12 hour flowering period to maintain 82F with the unit set at 78F.
hope this helps.
 
F

Freezy_

Active Member
@Growmau5 thanks for all the great info man you do some great wor for the cannabis community! Im getting a system all priced out. Now I can't stop reading about the emerson effect lol. I'm Def going to incorporate some far red lights into my build. Do you run them just at the last 15 minutes? Or do you run them all light period and an additional 15 mins at the end?
 
Humble grower

Humble grower

Well-Known Member
Freezy_ said:
@Growmau5 thanks for all the great info man you do some great wor for the cannabis community! Im getting a system all priced out. Now I can't stop reading about the emerson effect lol. I'm Def going to incorporate some far red lights into my build. Do you run them just at the last 15 minutes? Or do you run them all light period and an additional 15 mins at the end?
Click to expand...
I run mine for 15 mins. 5 right before lights out and 10 after lights out. That way if my timers get off sync (which they always do) it doesn't matter much
 
F

Freezy_

Active Member
okay cool that makes sense I'm anxious to try this out. I have to build a whole new room and all so I have a lot of work to do but I will do a journal on it for sure.
 
Growmau5

Growmau5

Well-Known Member
Don't confuse the Emerson effect with switching Pr & Pfr states

There is no evidence to suggest that running far red while the main lights are on does anything , nor does it really make sense or even matter that much. As long as you blast em with only far red for a few minutes once the room is otherwise completely dark.

Cheers.
 
F

Freezy_

Active Member
@Growmau5 When you use your far red what spectrum do you use and how many LED's do you use? If I want to incorporate the far red into my light fixture for my 4 x 6 area, how many far red lights should I throw in there?
 
Airwalker16

Airwalker16

Well-Known Member
Freezy_ said:
@Growmau5 When you use your far red what spectrum do you use and how many LED's do you use? If I want to incorporate the far red into my light fixture for my 4 x 6 area, how many far red lights should I throw in there?
Click to expand...
Far red is 730nm. You really don't need many leds though. It's just a signal. You don't need to blast plants like normal lights. One per every 4 sq ft is fine. I did 12 in my 4x4 just to be safe though ; )
 
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goofy81

Well-Known Member
Hi !
So i managed to connect a 100k resistor to dim my cobs.
I've noticed that the first 10% spinning of the knob, the LED is actually off. Does this ruin the LED if i just turn it off this method?
Also, is there any point to EARTH the aluminium angle frame when the only 2 cables are the LED (DC cables) cables? My driver is located in seperate room.
 
Growmau5

Growmau5

Well-Known Member
like airwalker said 1 x 3w diode at 700-1000ma per 4 sqft sounds about perfect. i mount mine to the ceiling now , with a tight lens like 20-45 degree.

- i ordered a bunch of stuff from Cutter to test out. 4up far red boards for cheap $11-12
cheaper, easier, and better than rapid led or steves
http://cutter.com.au/proddetail.php?prod=cut2202

$3.50 quad optic that works with their board
http://cutter.com.au/proddetail.php?prod=cut1000

driver: APC12-12 by meanwell for $6

stick it on with the Cutter die cut pressure sensitive TIM
http://www.cutter.com.au/proddetail.php?prod=cut952
 
Airwalker16

Airwalker16

Well-Known Member
Growmau5 said:
like airwalker said 1 x 3w diode at 700-1000ma per 4 sqft sounds about perfect. i mount mine to the ceiling now , with a tight lens like 20-45 degree.

- i ordered a bunch of stuff from Cutter to test out. 4up far red boards for cheap $11-12
cheaper, easier, and better than rapid led or steves
http://cutter.com.au/proddetail.php?prod=cut2202

$3.50 quad optic that works with their board
http://cutter.com.au/proddetail.php?prod=cut1000

driver: APC12-12 by meanwell for $6

stick it on with the Cutter die cut pressure sensitive TIM
http://www.cutter.com.au/proddetail.php?prod=cut952
Click to expand...
Man!!! FR in a box!
 
M

mameluco

Active Member
cutter , with what kind of DHL you work ? Dhl global mail or courier (dhl express)? Oh, and one more question: how much does the Mau5-IV+package weights?
Thank you!
 
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Rayne

Rayne

Well-Known Member
Growmau5 said:
Don't confuse the Emerson effect with switching Pr & Pfr states

There is no evidence to suggest that running far red while the main lights are on does anything , nor does it really make sense or even matter that much. As long as you blast em with only far red for a few minutes once the room is otherwise completely dark.

Cheers.
Click to expand...
I think the studies behind the Emerson effect suggest something happens.
Is there evidence that proves running far red while the main light is on, does nothing?

I bring this up because COBS that give off the equivalent of 3500k CCT at 90 CRI produce some far red the entire time they are on. (Link to a posted graph)
The source for the 90CRI posted graph. (See page 7 of 15)
Here is the source for the 80CRI posted graph. (See page 7 of 15)

Cree's CXB350 COBS produce some Far Red as well. The 3000K CCT 90 CRI has the most Far Red at 20% of the relative spectral power. (Link to PDF data sheet. See page 8 of 19)
 
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