Introducing CobKits.com - specializing in DIY and Citizen COBs

Do u ship to Australia mate?

yessir

Thanks mate, Whats the difference between a Cree CXB3590 and your CXM22? how many of the CXM22 will cover a 3x3' or 1x1 meter tent?

cxm22 is more efficient that cxb3590 and is half the price
you can cover a 3x3 with as little as 4 cobs or as many as 9 depending on how hard you want to run them

Yeah this is great i have been buying from Cutter Electronics and paying $95+ P&P per light kit, wish i had found your post earlier, but if i change to my bigger tent i will place a order with you for sure your prices are half of what I'm paying now!

How many cxm22 are needed to replace a 1000 watts hps?
If you were to build one how will you do it and what would be the cost?

Thanks in advance.

augusto1 said:

How many cxm22 are needed to replace a 1000 watts hps?
If you were to build one how will you do it and what would be the cost?

Thanks in advance.

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9 @75w is right in the range of an HPS

Thats mad and i bet it only puts off the heat of a 400w hps for 1000w equivilent

gazza2005au said:

Thats mad and i bet it only puts off the heat of a 400w hps for 1000w equivilent

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its about 700W with drivers and puts off as much heat as 700W of any other type of light - but it gives you as much light as a 1000 HPS

Make it dimmable so you have that option when you need it

Just throwing this out there, would running 9 COB's at 700watts with active fan cooling run cooler than 700watts of HPS?

see there are 3 options here passive fin, passive pin and active cooled, so i would imagine there would be some varying degree of heat output one would imagine?

gazza2005au said:

Just throwing this out there, would running 9 COB's at 700watts with active fan cooling run cooler than 700watts of HPS?

see there are 3 options here passive fin, passive pin and active cooled, so i would imagine there would be some varying degree of heat output one would imagine?

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Same heat output. 700w is 700w. COBs will displace that heat output better, mainly because of how spread out they're.

My package arrived yesterday from cobkits and I couldn't be happier...keep up the good work cobby. You'll be hearing from me again when I upgrade

I would like to ask if I can mix different model( 80 and 90 cri) of 1212 3500k on the same diver in parallel. Thank you

yes as long as they are both gen 5 or gen 6. electrically 80 and 90 cri chips are the same, the phosphor layer is the only difference. same for different colortemps as well (3000k, 3500k, etc)

gen 5 part number on the chip starts with an H (like H121230M2)
gen 6 start with a T

CobKits said:

yes as long as they are both gen 5 or gen 6. electrically 80 and 90 cri chips are the same, the phosphor layer is the only difference. same for different colortemps as well (3000k, 3500k, etc)

gen 5 part number on the chip starts with an H (like H121230M2)
gen 6 start with a T

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Thanks.
Based on 80cri vs 90cri 1812 grow,I would like to take advantage from 90cri better spectrum and 80cri more par a output. So mixing 6 x 90cri and 6 x 80cri like this:
X0X0
0X0X
X0X0
0X0X
0=80cri
X=90cri
,should work.....or not?

I plan on do something similar shortly, it really seems like a no brainer, widening that red peak out should really be a positive.

just because 80cri has higher PAR numbers doesnt mean plants will respond more strongly to it

kaivorth said:

Same heat output. 700w is 700w. COBs will displace that heat output better, mainly because of how spread out they're.

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The way I have understood it (and i could be wrong) is that heat output from whatever the draw is entirely dependent on efficiency.

If for example your driving 500w into a light that is 25% efficient then you will need to account for 375w of heat. Conversely a 500w light with 50% efficiency would require 250w of cooling power.

So actual heat your dealing with depends on the cob/how hard you push it, but if the above is correct then just about any cob should run cooler than a similar wattage HPS by a long shot.

BloodKil said:

If for example your driving 500w into a light that is 25% efficient then you will need to account for 375w of heat. Conversely a 500w light with 50% efficiency would require 250w of cooling power.

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on the backside of the chip, but all that light is getting absorbed in the tent/room and also turning into heat so total heat load is the same