Do I need LED?

[Skylan01]

TastyLED uses better parts than Johnson, IMO. One 89w T1-2100 has about the same PPFD as a 400w Super HPS in an 18x18 at 14-16 inches. You could probably move it closer for the light of a 600w, but honestly, it's already in that sweet spot of ~850 for a single plant at the paramaters I stated in the beginning.

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]

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.

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]

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.

 

[Olive Drab Green]

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.

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]

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.

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.

 

[Skylan01]

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.

 

[CryBby247]

spectrum is as important as luminous efficiency and their is a difference between luminous efficiency and radiant efficiency I use blue bulbs (6500k) for veg and then ad red(3000k) for flowering. use both in flowering check out youtube and other threads on this site and you will see some amazing T5 and CFL grows. the new CMH bulbs also seem to be very good and the better spectrum produces better tasting product.don't worry about offending anyone. you can't please everybody and it's your medicine your the one who will be using it. there is no one right way to grow. we all find what works best for us. I have a collection of LEDs gathering dust in my shed. (mars hydro. DIY cobs vero18.s cree 3070s citizen leds) and was not impressed by any of them.in my environment with the strain I grow T5s work best for me.you will find conflicting opinions here and companies promoting their products. it can be confusing.

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]

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...

 

[Skylan01]

I do have one advantage there, I've owned bonsai trees for years and have good training experience.

 

[mauricem00]

I do have one advantage there, I've owned bonsai trees for years and have good training experience.

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.

 

[Skylan01]

haha, totally agree..

 

[mauricem00]

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!!!!

I love led light bulbs in my home. just not for growing plants.

 

[mauricem00]

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]

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.

 

[Skylan01]

I'm researching COB's but I'm having a really difficult time finding all of the parts that I would need for this grow space. Has anyone put together a COB led for a 2x2 area that would be kind enough to share a parts list?

 

[Olive Drab Green]

I'm researching COB's but I'm having a really difficult time finding all of the parts that I would need for this grow space. Has anyone put together a COB led for a 2x2 area that would be kind enough to share a parts list?

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.

 

[Skylan01]

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?

 

[MeGaKiLlErMaN]

I'm new, never grown. Have a 2x2x5.1 gorilla tent being delivered soon. I plan to grow a single plant, high CBD indica heavy and I'd like to get obviously the most out of this plant.

Since it's such a small space I worry about any lighting that puts off too much heat, which is why I was looking at LED. But I've also been reading that even a couple CFLs that are properly placed might be good enough to get max yield from a plant.

I would have posted under the stick thread but it appears to be locked at the moment.

Shoot me over $200 an Ill ship you a 1000W HPS... lol

 

[MrTwist1]

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?

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]

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!