I was looking at this one, but it said for a 2x2 you need a T2 for flowering and a T1 for veg. You think the T1-2100 would be sufficient for 1 plant possibly using the screen method? Sorry i forgot the acronym.
Do I need LED?
- Thread starter Skylan01
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I was looking at this one, but it said for a 2x2 you need a T2 for flowering and a T1 for veg. You think the T1-2100 would be sufficient for 1 plant possibly using the screen method? Sorry i forgot the acronym.
Olive Drab Green
Well-Known Member
You can flower a medium-large closet plant no problem. It's got the power, it just doesn't have the footprint to do more than a single plant. I have two for two plants. They are driven at higher amperages than the T2 and above, so using two T1s would be more intense than a T2.
Rahz
Well-Known Member
If you grow well a T1 should yield 3-3.5 oz in soil. The T2 should yield about 6-6.5 oz in soil. (based on 1.25gpw)
In hydro those figures will be +.5oz.
This is assuming you are using the whole 2x2 space, either SCROG with a single plant or 4 plants with a short veg period.
In hydro those figures will be +.5oz.
This is assuming you are using the whole 2x2 space, either SCROG with a single plant or 4 plants with a short veg period.
Olive Drab Green
Well-Known Member
If I can break 3.5 with old 500w BlackStars and a single plant, I'll bet I can easily outdo 3.5 a plant with your lights. I'm thoroughly impressed.
Rahz
Well-Known Member
You were on these boards for a while before picking up one of my lamps, so nobody can say you didn't put the time in researching and gathering opinions. To a large extent I want to sell my lamps in particular, but I've been here for about 3 years now and have been saying the same things for almost 2 years before starting my company. I hate seeing people purchase crappy LED lights when they can spend a little more for something that will more than pay for itself the first round and last for years. Nobody needs to buy my lights, but please do the research on cobs and make an informed decision. 50-56% radiometric efficiency is common now with cob led and blows away the competition. In the future it will be even higher.
I'm going to do a bit more research on COB like you suggested but I'm leaning towards the T1 if I don't go that route. I have no idea how long it will take me to decide 
Also the amount of yield is not as important to me as the quality. 3.5 oz could probably last me over a year if it didn't start to degrade.
Also the amount of yield is not as important to me as the quality. 3.5 oz could probably last me over a year if it didn't start to degrade.
CryBby247
Active Member
That's really good information!!! Wow! I have the same experience some plants just die under the house led lights I dunno why but that's just what I see. Good luck and shop around I just like to see people growing. Over grow the world!!!!
dandyrandy
Well-Known Member
The downside to cobs in a restricted area is plant management. Growth with a lot of light in a small area can be fast. You will learn to at least bend a lot...
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mauricem00
Well-Known Member
maybe you could try a bonsai cannabis tree
. I have some bonsai blue cedars I grew from seed. funny thing. when you get older gardening becomes fun and entertaining.
mauricem00
Well-Known Member
mauricem00
Well-Known Member
funny cree list the output of their 3090 bd series 80cri diode at 11100lumens at 36 volts 2.4 amps at a junction temperature of 25 degrees (128.47 lumens per watt) their 3090 bd series 93 cri diode is listed at 8819 (102 lpw). that does not include driver loss. where is this 165-185 LPW claim coming from?
Rahz
Well-Known Member
You're looking at a CXA datasheet which is the older version of the CXB.
If you examine the datasheet for the CXB3590 you can determine the nominal LPW for a specific cob and use the current-vs-luminosity chart further down the page to discover the LPW at any particular current. You can use the average of the 85 and 25C values to get a more realistic temp estimate, or Cree has a product simulator http://pct.cree.com/dt/index.html that will do all that for you.
If you examine the datasheet for the CXB3590 you can determine the nominal LPW for a specific cob and use the current-vs-luminosity chart further down the page to discover the LPW at any particular current. You can use the average of the 85 and 25C values to get a more realistic temp estimate, or Cree has a product simulator http://pct.cree.com/dt/index.html that will do all that for you.
Olive Drab Green
Well-Known Member
Rahz lists what he uses. T1:
Best for flowering in an 18x18, but you could probably easily get enough light that a 2x2 would flower fine.
Cree CXB3590, 3500k, 80 cri, 36v CD Bin (Top).
Driven with a Meanwell LPF-90D-42 driving 2150mA.
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Yeah sorry , so new to the COB terminology that I didn't even realize you were listing COB parts. I did get ahold of cobkits and he linked me a driver and a light engine. I guess that's all I really would need since the engine has the fan / reflector / heat sink , etc in it?
Only problem is it's 3500K. Do I need to buy 2 engines, 1 for flower / veg, or can i buy just an extra chip and swap it?
Only problem is it's 3500K. Do I need to buy 2 engines, 1 for flower / veg, or can i buy just an extra chip and swap it?
MeGaKiLlErMaN
Well-Known Member
Shoot me over $200 an Ill ship you a 1000W HPS... lol
MrTwist1
Well-Known Member
3500K is great for veg and flower. It has been deemed by some to be the best all-rounder.
Yes that is why I recommended the light engine - it is very simple to wire it up and the COB is already mounted for you. You will also need a 12v power supply to power the fan, and some wires, and a plug for the driver.
Alternatively just buy Rahz's light and all of that is done for you. Both great options. Just do it dude.
researching
Well-Known Member
No, you do not need LED's. I am sorry but my wife calls me mr literal and that is the literal answer to your question. 
Sorry I couldn't resist.
I have a wonderful 250w hps/mh setup you should buy. It'll help fund an led build for my veg tent. I don't need leds, but I want them!
Sorry I couldn't resist.I have a wonderful 250w hps/mh setup you should buy. It'll help fund an led build for my veg tent. I don't need leds, but I want them!