Noob questions regarding cob/blurples

sunsp0ts

Member
Hey guys,

I'm in a 2x4x5, I'm using 4 VectorSpectre blurples. 2 of which are the V300's (the originals that are more blue / white, more suitable for veg) and two R300's, (far more red LEDs and better for flowering, they look more red than blurple, I'm hoping a lot of the VS slamming is more about the original and that adding in some R versions will help my yields). I'm doing every other, so for every 1x2 in the tent there is a blurple, and it goes v300, then r300,etc. I have a 200CFM fan keeping the temps around 82. All in all the wattage for my 4 blurps will be a little over 500 (actual measured via killawatt) for 6-8 plants (some may be males), each plant gets a square foot. The Spectres in total for 4 only cost me $300 shipped. Which I think is pretty damn good, from what I've read a 200 watt COB will cost that much. Or am I just kidding myself? I have the technical know how and all the equipment (soldering irons/rework stations/etc) to build a COB setup but the burples are so damn cheap and easy.

Also, my tent is only 5ft tall and my soil takes up a foot, the lights take up a foot, then I need to keep a gap between the lighting and the canopy. So in the end I'm looking at at MOST two feet out of my girls. Which blows, I'd like at least 3. I keep reading about COBs and I'm within my return window for these blurples, so I was thinking about building one. Problem is I'm also reading COBs need to be a very large distance away from the canopy. Someone was saying they had to have their COB lights 3-4 feet away, maxing out their 5 ft tent immediately at seedling. I'm starting to think because of the fact that I have a grow tent I'm stuck with blurples. How do you guys use COBs with such tight height restrictions?

I do have the possibility of switching from my 2x4x5 to a 3x3x6, I even have the tent, it won't be as discreet as my current setup but I'd have an extra ft in height not to mention grow space, but I really like my current discreet setup, it's almost perfect since it tucks behind my furnace, any noise is masked by furnace, no one will snoop behind it, I have an exhaust vent pipe to the outside if needed during flowering, heat signature blends right into my hot water heater and furnace when checked with my FLIR. If I switch to the 3x3x6 It'l have to go to the right of the furnace, which anyone coming down to checkout my full size server rack will end up spotting. And I'm extremely proud of my badass server rack :P

One other thing I also have a 150w HPS that I found about 10 years ago from a broken street lamp, I'm not sure how I'd get it in the tent with the rest of the blurps but I suppose it's a possibility.

What do you guys think? Just looking for thoughts or opinions, don't really have anyone but me who gives a shit about this hobby so any like minded enthusiasts willing to give some opinions I'm listening!
 
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Rahz

Well-Known Member
I have a lamp I built using 30w cobs, can keep it 6" from canopy. It just depends on how well the light is distributed. 50w cobs are probably better at 10-12" from canopy, 100w cobs 16-18" from canopy, etc. 3-4 feet is a little much IMO. Maybe with a 600-1000w cob but nobody is building with something like that.
 

Opie1971

Well-Known Member
From the reports and results from several different members here, these are the way to go.
I'm gonna be picking up a few of these asap, I think the shipping on the one pictured above is like 67ish, making the total a little over 200, a very good deal IMO. The only thing is I want to find a setup that has a longer heatsink, to space the boards a foot apart.
 

sunsp0ts

Member
What's the turn around on these since they're coming from china? My return window is about a month on these blurps.
 

Opie1971

Well-Known Member
What's the turn around on these since they're coming from china? My return window is about a month on these blurps.
Not sure man, I haven't checked into that. @Moflow has a thread going about these Alibaba lights, he would know more about it than I, I'm pretty sure he has purchased several of them.
 

whytewidow

Well-Known Member
Cheap simple and will increase your yield over viparspectors is Samsung f series gen 3 strips. Run 8-10 of the single row f562bs on a HLG-320h-24A or 480h-24a use cheap alum channel from home depot. You can have the driver and strips in two days. Just over 200 bucks. Increased par lower wattage increase yield. 10 f562bs is like 137 shipped. Then 93ish for the 320 driver. 25 bucks in alum from home depot. It will rock that 2x4 tent. I'm running the samething and pulling consistent 5-6 zips per 2gal pot under them.

Edit: and you dont have to deal with China customs and expensive shipping.fees.
 

sunsp0ts

Member
Are the benefits between these and what I'm using THAT big to where it's a no brainer? I'm finding sooooo much dis and misinformation, so many people raving about cobs but then I see sellers of the kits on here and I'm struggling to cut through the bullshit and find some actual facts about what is better and why.
 

sunsp0ts

Member
hmm, I'll look into that. I read somewhere that LED strips don't seem to last very long, start to dim out and die, do you know what kind of warranty these have?
 

Humple

Well-Known Member
Are the benefits between these and what I'm using THAT big to where it's a no brainer? I'm finding sooooo much dis and misinformation, so many people raving about cobs but then I see sellers of the kits on here and I'm struggling to cut through the bullshit and find some actual facts about what is better and why.
Yes, the benefits are THAT big, and it IS a no-brainer.
 

Humple

Well-Known Member
hmm, I'll look into that. I read somewhere that LED strips don't seem to last very long, start to dim out and die, do you know what kind of warranty these have?
Not sure what strips you were reading about, but Samsung F series strips should last a good 50,000 hours.
 

sunsp0ts

Member
Cheap simple and will increase your yield over viparspectors is Samsung f series gen 3 strips. Run 8-10 of the single row f562bs on a HLG-320h-24A or 480h-24a use cheap alum channel from home depot. You can have the driver and strips in two days. Just over 200 bucks. Increased par lower wattage increase yield. 10 f562bs is like 137 shipped. Then 93ish for the 320 driver. 25 bucks in alum from home depot. It will rock that 2x4 tent. I'm running the samething and pulling consistent 5-6 zips per 2gal pot under them..
I wouldn't need any kind of heat sinks? The aluminum would be enough?
 

sunsp0ts

Member
Also, where do you see 10 samsung f series gen 3 at 3000K for 137 shipped, on digikey they want 167 for 10 before shipping. part SI-B8V261560WW
 

whytewidow

Well-Known Member
Cobs are good. QBs are good, strips are good. Strips give you a little more application designs. And give you extra head room. Same as an. Thin n light. I went with strips bc of price. I got them when they were cheap b4 everyone really started using them. In my opinion I like strips n QBs over cobs. More points of light sources for better spread. But in a 2x4x5 tent I'd go with strips or QBs over cobs.
 

sunsp0ts

Member
Okay, thanks to everyone, especially whytewidow, I'm leaning towards this:

10x SI-B8U261560WW, that's 3500K, only 127 shipped for 10
and 1x 320watt driver that he specified.

And that will beat out my 4x ViparSpectre 130 Watt Lamps in both efficiency, startup costs, AND PAR values?
 

Rocket Soul

Well-Known Member
Tbh, im not sure 10 strips in a 4x2 at say around 300w would beat out 500w of blurples, when you basicly got the whole cannopy covered by light. Id think it would be fairly even. If you dont mind those 200 extra watts.
Butt you could probably run both your tents on 600watts of samsung leds. We used 4000 samsung lm561c over more or less 4x7, using maximum 750w and the amount of light blew us away. +1000ppfd and even coverage, with around +600 2feet down.
But a heavy red grow with a lot more wattage might be a better way to maximize your square foot.
 

whytewidow

Well-Known Member
Also, where do you see 10 samsung f series gen 3 at 3000K for 137 shipped, on digikey they want 167 for 10 before shipping. part SI-B8V261560WW
You dont need 3k. 4ks flower great help control stretch a little. And produce more frost than 3ks. I have both and have flowered with both. The 4ks flower better plain n simple
 

rkymtnman

Well-Known Member
You dont need 3k. 4ks flower great help control stretch a little. And produce more frost than 3ks. I have both and have flowered with both. The 4ks flower better plain n simple
what is your opinion on strips/qb vs cobs for canopy penetration??

i've got 6 80w cobs and i can still grow fairly tall plants without training them and get decent buds most of the way down the plant.

can strips/qbs do that? or are they better suited for sog/scrogs?
 
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