Introducing CobKits.com - specializing in DIY and Citizen COBs

CobKits said:
not in the same color. thats his point. in jorge's eyes 2700 90 cri is a superior spectrum and the 1825 still matches the par output of the 3500k cree.A 2700 90 cri cree would not have the same output

1818s are a closer match for 3590s
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Actually, I don't know about better spectrum, but the combination of high CRI and low color temperature makes it less efficient, -especially- when measuring PAR. A lot of the 2700K 90CRI output is above 700nm, outside of your sensors range. That's what makes it's comparison against an 80CRI 3500K cob so surprising.

I wanted a 2700K 90 CRI to mix with my 4000K, because that's easy and inexpensive for me to do with an already done build. After digitizing every Citizen spectrum, 3500K 90CRI is probably the best looking/most natural looking all-rounder.
 
JorgeGonzales said:
Hmm...website said $25 estimated shipping, which is what scared me off. Shipping from Europe or Asia is usually under $10 to me, but it's not 2-day either.

Ah, I see, even after you select your country it's still in AUD.

Apologies @welight . $18 is still a bit high, but not crazy so.
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no problem, please note USD conversion occurs at the bank, so when you pay your bank will convert AUD invoice into USD
Cheers
Mark
 
ill
JorgeGonzales said:
Actually, I don't know about better spectrum, but the combination of high CRI and low color temperature makes it less efficient, -especially- when measuring PAR. A lot of the 2700K 90CRI output is above 700nm, outside of your sensors range. That's what makes it's comparison against an 80CRI 3500K cob so surprising.

I wanted a 2700K 90 CRI to mix with my 4000K, because that's easy and inexpensive for me to do with an already done build. After digitizing every Citizen spectrum, 3500K 90CRI is probably the best looking/most natural looking all-rounder.
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ill run 80 vs 90 cri and see what the difference in par is
 
CobKits said:
premade lights like northerngrowlights.com are an amazing value for what they return (esp relative to a box of unassembled bullshit)

DIY can be a value but its more of a hobby. nobodys getting rich making their own lights you have to want the thrill of the chase
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I'm sure i could learn how to build a light. I'm a carpenter by trade. Ahit i installed a 200 amp service at my home new everything from the power lead to the new panel and many new circuits. But have never built a light though
 
Michiganjesse said:
I'm sure i could learn how to build a light. I'm a carpenter by trade. Ahit i installed a 200 amp service at my home new everything from the power lead to the new panel and many new circuits. But have never built a light though
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electronics is a fun hobby with a low learning curve to get started. low voltage dc power is easy to work with relative to AC mains. lots of people here to advise if/when you get stuck
 
Hey guys. Question. So know little about COB lights. If I wanted to replace a good 600 watt HPS setup with COB, what kit options would I choose. Also think budget minded and dimmable as well. Also, how about replacing a 400 Watt HPS? Please consider I just need a good dependable light. I am not commercial at all and will only grow micro. It would be nice to have options such as the economy version and premium version for a comparison. I would even consider an already built unit but, have some schooling in electrical so building one wouldn't be an issue. Thanks again.
 
Michiganjesse said:
I'm sure i could learn how to build a light. I'm a carpenter by trade. Ahit i installed a 200 amp service at my home new everything from the power lead to the new panel and many new circuits. But have never built a light though
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You can actually use the same components... but its totally overkill, unnecessary, and inefficient. I know a guy who decided to make his power supply remote from his lights, so he built a separate panel using standard electrical supplies. Yeah, that's it, I know a guy who did that. LOL Sometimes we use what we know. ;)

07.16.16_power-supply-board.jpg
 
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GrowUrOwnDank said:
Hey guys. Question. So know little about COB lights. If I wanted to replace a good 600 watt HPS setup with COB, what kit options would I choose. Also think budget minded and dimmable as well. Also, how about replacing a 400 Watt HPS? Please consider I just need a good dependable light. I am not commercial at all and will only grow micro. It would be nice to have options such as the economy version and premium version for a comparison. I would even consider an already built unit but, have some schooling in electrical so building one wouldn't be an issue. Thanks again.
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rule of thumb is 65-75% of the HID wattage you are replacing
 
Humanrob said:
You can actually use the same components... but its totally overkill, unnecessary, and inefficient. I know a guy who decided to make his power supply remote from his lights, so he built a separate panel using standard electrical supplies. Yeah, that's it, I know a guy who did that. LOL Sometimes we use what we know. ;)

View attachment 3755641
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Man i like your board setup! Nice and tidy, nice job.
 
ReddEyez said:
Man i like your board setup! Nice and tidy, nice job.
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Thanks bro. I was using lots of recycled materials, from the board its attached to, to a bunch of boxes and switches I had left over from other projects, and all the drivers I had on hand from earlier light experiments. I'm not an electrician, but I've done my own electrical work. Like I said, its not an efficient use of space (or weight! lol ), but it works!
 
Humanrob said:
Thanks bro. I was using lots of recycled materials, from the board its attached to, to a bunch of boxes and switches I had left over from other projects, and all the drivers I had on hand from earlier light experiments. I'm not an electrician, but I've done my own electrical work. Like I said, its not an efficient use of space (or weight! lol ), but it works!
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Right on man, looks good. I wish I had a few extra meanies laying around. ;)
 
GrowUrOwnDank said:
Hey guys. Question. So know little about COB lights. If I wanted to replace a good 600 watt HPS setup with COB, what kit options would I choose. Also think budget minded and dimmable as well. Also, how about replacing a 400 Watt HPS? Please consider I just need a good dependable light. I am not commercial at all and will only grow micro. It would be nice to have options such as the economy version and premium version for a comparison. I would even consider an already built unit but, have some schooling in electrical so building one wouldn't be an issue. Thanks again.
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HLG-320H-2800B $100
2x cobkits CLU058 iceled/cob/reflector combos $144 from cobkits.com

That's a 300W dimmable light, $244 for everything but aluminum angle, wire, 50 cent pot, equivalent to a 400W HPS.

It's not the most efficient, but compared to HPS it is.
 
CobKits said:
the one in bold?!?
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Do you know how long on the backorder?

I placed an order with cobkits for 2 more 3590's on Friday less a driver.
Now have accumulated 6 sets of 3590's and the heatsinks,etc.
Want to run at 36 volts and 50 watts per cob, 6 cobs. That is the 320/1400...
 
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