Have any of you DIY COB Growers finished a crop under 1000W DE HPS? - POLL
- Thread starter OneHitDone
- Start date
BOBBY_G
Well-Known Member
36V cobs run at 700 mA pull just under 23W each (32.72V*0.700A = 22.9W)
ttystikk
Well-Known Member
Right, figured that. I'm just trying to learn, not necessarily trying to swap out my brand new chips already lol
BOBBY_G
Well-Known Member
current droop is relative output dropping with higher current
temperature droop is relative output dropping with higher temp
different equations, both represented on this graph:
so the 'reference' measurement is the red line which is a Tc (case temp) of 55C, it is 100% at 2.4A.
if your Tc goes up to 85C, you have to run almost 2900 mA to get the same lumen output- pretty inefficient!
so lets put a fat ass heatsink on there and get the Tc temp down to 25C - ah, now were gettign the same 100% lumen output at a cool 2100mA! alternatively at the original 2400 mA we'd bump up to about 105% of lumens!
swagslayer420
Well-Known Member
good looks on the infoLike I said bro. Any help you need to build your first lamp I'll gladly give any tips I can. Just build one and replace one light. See for yourself. I wouldn't change all my lights out without testing it out first myself. Also I'll just drop this little bomb here that a bin jump is coming in cree in the next month or so. So go ahead and expect 9-10% more output from all the cxb line.
Stephenj37826
Well-Known Member
Yeah I understand that but it's not 10% more efficient it's 10% more lumens per watt. So at 1.4@ the 3500k cxb3590 is not going from an overall efficiency of 56.34% to 66.34% Is all I was getting at lol.
Stephenj37826
Well-Known Member
chuck estevez
Well-Known Member
AGAIN, If and WHEN a unit is AS GOOD or BETTER than a Gavita comes out. EVERYONE will know about it, SO until then, STFU
I love when HEAVILY invested LED users get all butthurt,LOL
chuck estevez
Well-Known Member
DE never had the scrutiny that LED does ,HMMMMMMMMMMMMMMMM
Stephenj37826
Well-Known Member
............wow whos getting all excited over here lmao. Don't worry there are gavita replacement fixtures on the market right now. Like I posted earlier it took 8 years for DE to be accepted. Just because there was no internet chatter didn't mean there wasn't arguments over its superiority. Market adoption doesn't happen over night. To refute hard numbers is basically sticking ones head in the sand pretending that it's all a good/bad dream. Just like I told mongo. Build one light just one. Build it properly and give it its fair due and you will see with your own eyes. If you do that and then you produce significantly less per watt come here and rub it in our face lol. Making blanket statements without real world experience with what your talking about is honestly not conducive to anyone.
chuck estevez
Well-Known Member
I NEVER had to build a light.( grower,not a light builder) I bought the best available at the time. LED has been around for YEARS. in fact, when the blurples didn't do everything they claimed, they switched up to bright whites. what are they going to switch to next to TRY and be as good as HPS?
they are ALWAYS TRYING to be as good as HPS, they just aren't though.
bicit
Well-Known Member
Well that's not strictly true. @ttystikk could always add a second set of the 72v chips. Four cobs wired in series, two sets of cobs wired in parallel for ~350ma per string. @MrFlux did something similar with vero 10's some time ago.
Not an endorsed configuration, but certainly possible.
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chuck estevez
Well-Known Member
gavitas took 8 yrs to be accepted?LOL more like 8 years to TAKE OVER the market
Gavita is the oldest specialised horticultural lighting company. We build on 30 years of accumulated knowledge and innovation. Many of the Gavita innovations are now de facto standards in horticultural lighting.
In 2009 Gavita entered the market as Gavita Holland bv with a selection of adapted professional luminaries and a series of new products for the international retail market.
Based Aalsmeer, The Netherlands, Gavita serves customers world-wide. Our installations range from 1 - 40,000 luminaries per site. As a development partner of Philips, General Electric and Osram, Gavita designs and produces state of the art electronic ballasts, high efficiency reflectors and complete fixtures. We build OEM equipment for several large lighting companies.
For greenhouses and indoor facilities we design lighting plans and in our testing facilities we evaluate lamps and reflectors for hundreds of horticultural growers. Testing facilities include the Ulbricht integrating sphere for accurate light measurements and a photogoniometer for reflector measurements.
Being a front runner in lighting development Gavita tests and implements new technology, such as plasma light and high frequency electronic ballasts. Our innovative reflector designs offer the highest efficiency in the market.
chuck estevez
Well-Known Member
Oh, and there is a reason gavitas are being copied by other companies, YET, those companies AREN"T copying johnson grow lights or ANY LED for that matter.
Stephenj37826
Well-Known Member
Well sit back and relax and enjoy the show. Your mind is made up. I only suggested to build one to save you a few bucks incase it's a waste of money in your opinion. Science is on my side. Just like cannabis not being some super addictive deadly drug there are those that fight blindly to the end without ever actually doing due diligent research. Johnson Grow Lights is what 6 months old that argument is childish honestly. Not here to argue the proof will soon be evident. Also I never heard people yelling from the roof tops 6 months after Gavita introduced there fixtures either.
frica
Well-Known Member
What is there to copy?
It's just a COB a heatsink and a driver, optionally some fans most often in a case.
In the end it's a fact that high quality cobs wether it's Bridgelux or Cree or Nichia or whatever are more efficient than DE HPS, depending a little on how hard the LEDs are driven.
Philips 1000W DE HPS = 2.07 umol/s/dissipation W (41.5% efficient)
Philips 315W CMH 4200K = 1.95 umol/s/dissipation W
Bridgelux Vero 29 3K V2.0 @ 79W = 1.97 umol/s/ dissipation W
Cree CXA3070 3K AB @ 52W = 2.11 umol/s/ dissipation W
Cree CXA3070 3K AB @ 25W = 2.46 umol/s/ dissipation W
Cree CXB2530 3K U2 @ 18W = 2.4 umol/s/ dissipation W
Cree CXB3070 3K AD @ 50W = 2.34 umol/s/ dissipation W
Cree CXB3070 3K AD @ 24W = 2.7 umol/s/ dissipation W
Cree CXB3590 3K CB @ 49W = 2.52 umol/s/ dissipation W
Cree CXB3590 3K CB @ 23W = 2.86 umol/s/ dissipation W
Cree CXA3590 5K DB @ 24W = 2.96 umol/s/ dissipation W
patrickkawi37
Well-Known Member
Not everything is as it seems on paper. This is Is why some people own businesses .. And some talk about owning them. Anyone can think they are right with some numbers on a piece of paper. I overshoot my estimated run costs by 20% almost every time. Nothing is what it seems. You'll always use more light, nutes, break shit. Stuff costs money. It is not cheap to grow cannabis.. There are very very few making the insane bucks that most of you think is out there.. Dudes might be doing well with LEDs but they aren't worth the investment you can argue it til you're blue in the face. Someone stated about about how there are plans this and someone talking about that. Let's fucking see these fat shops with nothing but led. No one in my circle fucks with it, and we all clear over 2 per lamp EVERYTIME. So we are doing something right. An average 5k sqft warehouse costs upwards of 100k to setup. The way I see it, you don't get that money back for a year. And that's with hps budget growing.. Who's to say you don't get your door kicked in.. We're trying to turn a profit here, kinda hard to do when you fork out 10x the investment for gear.. For what? So you can be with the coolest hottest new gear? I pull 3 per 1k fixture on a consistent basis , why The fuck would I change anything? To lower my electric bill? Who the fuck cares about the electric bill when you're talking about buying 60+ fixtures for 2k a pop lol. That's like 8 years worth of electric bills to save 20% or so on my power bill... Where is my math wrong here? Where is the return on investment . Anyone that says they plan on getting there money back first round. Has never grown more than a couple lights . And dude above says he can payback an LED grow first batch. Have you ever grown anything more than a closet setup? No comercial grower is going to grow with 315watt cmh either hahhah
patrickkawi37
Well-Known Member
All the dudes hyping DE as well... How tall are your ceilings? I am working with 9 feet and do better under 1k single ended than 1k de. Just because the height restrictions . I use some gavita 600/750 in a small grow and they do great ... Just as well as the standard 1k in my opinion. Does anyone have a room full of 600/750s? Curious of the gpw pull on this. I was able to clear 2.3 ps from 1 fixture in 600 watt mode. That's about 1.7gpw... And that fixture is under 400 bucks . That sounds a bit more efficient than a cob for the cost am I wrong?
chuck estevez
Well-Known Member
If a LED unit hits the market that grows as much weed as my DE and uses less power to do it.I'll be first in line to buy it.
I don't want to spend 2500 bucks on 3 units to replace my 1 gavita either.