Replacing 2000 watts of HPS with 1000 watts COB LEDs

Tstat

Well-Known Member
So, I have been a member here for a number of years. I have stopped in sporadically over the years for advice and now I'd like to give back. I'd like to chronicle my latest project- switching over to COB LEDs!

A year ago I ran into these guys from ProMax Grow. They had a light priced around $1200 that they claimed would replace a 1000 watt HPS at half the energy consumption and virtually no heat. I was intrigued and started looking into LED as an option.

What I found out here was these lights don’t live up to their claims and are old technology. The way to go these days is with COB (Chip On Board) LEDs. They are efficient, provide the right color spectrum, run with hardly any heat, and EXPENSIVE as hell. But I kept looking and learning about LEDs and how to grow with them.

See, I am running 2000 watts of HPS in the cooler months and 1600 in the summer. My electric bill was through the roof and heat was a real problem for a few months here in the Northeast.

I ended up hooking up with a guy who knows his shit about LEDs and electricity. He is assembling these COB LEDs for a crowd funding campaign, and I was able to snag one of his “Mailbox” LED lights for around $200.

So, my ultimate plan is replace ALL the HPS with these COBs. We think it should take about 8 or 9 to fill the main grow area. We grow in RDWC system I built, based on Current Culture’s systems. Right now I have that main RDWC section which is 7×3. I also have a small tote DWC in front where I place 8 plants to get a head start on flowering. By the time there is room for 8 plants in the RDWC, these have already started flowering for a few weeks. It just speeds up the process. Anyway, this is where the mailbox is right now- over the tote. I used to have a 400 watt HPS over the tote. Now, I know that size space should get another mailbox, but I just want to see how the plants react to the light.

Here is a shot of the 7×3 RDWC system with a 1000 watt HPS and a 600 watt HPS:

So, once I get 2 more of these COBs, I am going to replace the 600 with 3 of them (moving the first one I bought and getting rid of the tote for summer). The 600 is closest in the photo, the 1000 back over those taller plants.

So, my purpose is twofold, I want to help people on RIU who are thinking of replacing HPS with COB LED. I see a ton of posts about tents, but not much about using these new lights in a larger area. I also want (need) feedback about my room, my grow, the lights, etc. I have been at this since the 80’s and pretty much have everything under control- except the electrical costs involved with running HPS. Oh, and I want to not have THIS anymore:

So, hopefully there is some interest in the endeavor! Please ask any questions and make any comments you might feel are helpful. It’s going to take while, but I am psyched!
 

J Bleezy

Well-Known Member
I'm finishing up with my first cob grow soon and if it impresses then I'll be replacing 2000w of hps with 2000w of cobs and doubling up my sq footage. They're very easy to assemble.
 

Tstat

Well-Known Member
I'd love to be able to assemble some. I'm not good with electricity I don't think. I did think about deconstructing the mailbox, but I don't know.
So, you're finishing up- what are your thoughts on the flowering compared to HPS?
 

J Bleezy

Well-Known Member
Oh man, trust me when I say it's simple and you CAN do it. Just takes a little time, tapping the heatsinks was the most annoying part. I'm doing 12 cxb3590 driven at 1050ma (480 watts driven softly)over a 4x4 and it looks like it's going great, buds are smaller than previously with hps but much better shape to them and possibly more dense. I have to wait for results, but I wouldn't be surprised if it kept up with the hps. Quality looks great.
 

Tstat

Well-Known Member
Well, I'm not "planning" to build them myself. I mean I wish I could, but at $200 it's probably best for my light guy to handle it. I have no experience with wiring and soldering, so I am leery of trying to make them myself.
 

kachiga

Well-Known Member
Should find out what cobs and drivers are being used (or post if you know too :))

I'll watch this, during winter I am going to run 600 hps vs some cobs as well.

Did you have an ac running before as well?
 

J Bleezy

Well-Known Member
Well, I'm not "planning" to build them myself. I mean I wish I could, but at $200 it's probably best for my light guy to handle it. I have no experience with wiring and soldering, so I am leery of trying to make them myself.
There was no soldering involved in making my light. There's the growmau5 kit available now. Pre tapped heatsinks and all, just push a few wires through some holes, screw in a few screws, connect to the driver and you are done.
 

J Bleezy

Well-Known Member
This guy is the man and you'll see him on the LED forums a lot. Really knows his stuff, he's the reason I decided to attempt to build a light and I really couldn't believe how simple it was. Very informative videos

://m.youtube.com/watch?v=fAoXBKVcHeY
I guess youtube links aren't working here now. YouTube channel Growmau5
 

Tstat

Well-Known Member
Should find out what cobs and drivers are being used (or post if you know too :))
Here is what I know about the mailbox:
  • LED driver, LED driver Cob arrays: Bridgelux v22 4000k 6000 lumen COBs
  • LED heatsink/fan combo. Fans run on 12v 300ma driver.
  • 120 degree 40mm lenses.
  • They draw 110 watts total.
  • Around/over 15000 lumens

So... first, what do you guys think of the components and second, how much do you think I could save if I figured out how to make them. I paid $200 and that included shipping.

This guy is the man and you'll see him on the LED forums a lot.
Yea, I hear about him a lot. I guess I have something to watch tonight and thanks!

https://www.youtube.com/results?search_query=Growmau5

Wow, LOTS of videos!
 

J Bleezy

Well-Known Member
I read a lot of good things about veros. You could probably make that light for under $100 depending on what type of driver he's using. But one of the great things about diy is that you can (probably) get a better driver than what he's using and literally make a light that fits your space and your needs perfectly.
I was trying to link to the growmau5 cutter kit video
 

Tstat

Well-Known Member
I just finished watching the video. It looks too easy, lol. Now, I see that the growmau5 kit costs $456 and probably doesn't include shipping. But, that is for 4 COBS so I don't know if it is cost effective. I paid $200 for 2 COBs...

I mean I can certainly see myself making this, but I don't want to tap the heatsinks. I also need to explain that I know next to nothing about COBS- which are the best, etc. In fact that goes for the whole process. But I love to learn AND save money, LOL.

Oh, BTW, it's a Glw 3000ma 20-38v led driver.
 

kmog33

Well-Known Member
I read a lot of good things about veros. You could probably make that light for under $100 depending on what type of driver he's using. But one of the great things about diy is that you can (probably) get a better driver than what he's using and literally make a light that fits your space and your needs perfectly.
I was trying to link to the growmau5 cutter kit video
Parts come out to ~110-120(not including shipping) +$35 to ship. So essentially he's paying $30-50 for Not having to put it together.
 

J Bleezy

Well-Known Member
I didn't find anything on the driver that's being used and I don't know if veros have bins, but I know they're on the cheap side. Also don't know what type of heatsink or fan he's using.
 

Tstat

Well-Known Member
You mean using the angled aluminum to create a frame? (I've been watching the videos, lol) I wonder if I could find a local machine shop to drill heat sinks? It seems like that is the hard part...
 

Airwalker16

Well-Known Member
You mean using the angled aluminum to create a frame? (I've been watching the videos, lol) I wonder if I could find a local machine shop to drill heat sinks? It seems like that is the hard part...
Drilling aluminum is CAKE even by hand. Just use a titanium nitrate bit.
 
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