Marijuana Bloom with 504W LED

wow. it seems like every time i find a system of growing that i think works for me i find something else on this damn site. those leds are flat out amazing. I have yet to make my first big investment in large lights and a tent but before i was honestly thinking of a 1000w because i assumed after all the research i had done on here that that was the industry standard. EVEN IF leds cant compete with hid RIGHT NOW this is still an up and coming technology that is being refined and improved upon DAILY. I may still go with hid because I have seen great results but I will definitely keep my eyes on this. obtaining the same results with no heat issues and a lower electric bill is VERY important to me and i applaud the individuals who are pioneering this new frontier of growing



p.s. if anyone has any up to date info on leds PLEASE PLEASE send me a message with links or info THANK YOU!!!!

laserbrn said:

I have been a hater on LED's for a loooong time. I still don't think they are worth their weight.

I have a 4x4x7 grow tent that I currently run a 600w light in. I will purchase your LED panels if you will offer me a 90 full money back guarantee. If I am not impressed with the results and/or don't out yeild my 600w I want a refund. Does that sound fair? If you are that confident in the equipment, extend that confidence to me.

I don't mind dropping the money on the lights if they work, but I can't see the risk in it.

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Send her a PM and you'll probably get a more direct response. In case you missed it, she did request that sales questions be moved outside this forum.

Just finished reading your thread, LEDgirl. Even if I don't see myself getting LED lighting for a few years, I am very interested in your comparisons, especially the watt to watt comparison of HPS to LED by Ed.

Interesting read. Keep us posted.

as far as i'm concerned LEDs arent shit to HID in super big grows. maybe in a couple years when the technology becomes better(and cheaper) then i'll give it another try.

My question isn't really a matter of sales. It's a matter of principle. I'm not looking for the details, just make that the point. That's the way it should be with any new product you are trying so desperately to push. Even GM is offering a money back guarantee on their cars. You want to prove your product is worth a shit, stand behind it.

led girl how long did you veg your plants for? have you tried these lights on conventional sog style with 7 to 14 day veg times. how are the buds when the plants are still small?

the set up looks awesome im still not convinced about the yield but my thinking may be bias due to all the bad yields i have read about with led, your shit looks very bright and the buds looks nice im just wondering how long it took to get the plants to its size.

Well I have to say that I was skeptical about led lighting in its current state for plant cultivation, but by getting Ed Rosenthal to do the test I believe the results will be all the proof you need.

Besides naysayers will always be naysayers. People used to think that T.V.'s were a futile endeavor, and that people would get sick of staring at a box, those were the people that didn't own one. People thought space travel was impossible. if you told people in the 1930's that we would be able to make a 3terminal solid state transistor smaller then a grain of sand, they would probably have laughed until they cried. This happens simply because people think they know everything, and the fact is we know almost nothing about the world around us. If i told someone in the 16th century that a rock and some lamp oil would allow everyone to travel around in boxes at breakneck speeds, and would make horses obsolete for travel, I would probably be hung for spreading lies.

What I'm trying to say is this: By saying that HID lighting will always be the commercial standard for plant cultivation, you are admitting that you know very little about technology, and probably do not know how MH and HPS lights work, and you also are saying that you know very little about botany.

I dare any naysayers to try and explain why they think that HID lighthing will always be the standard?

you would think a bunch of potheads would be more openminded. It's really too bad, we are on one of the premier marijuana related message boards in the world, filled with marijuana users that pride themselves on their open mindedness, yet when their dogma's are slightly challenged, they react no differently than a bunch of bible thumping, close minded, bigots who they themselves would declare their enemy. Incredible.

Fujin said:

Revisiting the space I will be working in revealed that I will have a 49 sqf area to work with (about 5.5 sqf per plant) which is much smaller than I thought but may actually work out to my advantage.

If I raise or lower my LEDs concurrent with canopy growth (maintaining a 12" space between canopy and light), doesn't this mean that I "only" have to design a configuration that will efficiently cover that 49 sqf from beginning through bloom?

I noticed on the website that the 126W has a coverage area of 2'x3' at 12". I wonder if I can squeeze more coverage area out of fewer lights if I experiment with configuration... I also noticed on the website that IR is included in the spectrum. You may have already covered this and I missed it but enlighten me on why this is so?

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Ok, so 7' x 7' growing space. Each 126W unit can cover 2' x 3' at 12", and when running multiple units, you want to place them about a foot from each other, to get a bit of overlap. Each unit measures 12" wide, and projects 24" wide. They are 19" long, and project nearly 36" long. So the light doesn't travel very far from the light, in a lateral motion. At minimum, I would personally run 9, 126W units over that area. For better coverage, I would do 12. I've attached two scaled images, showing these two configurations within your space. IR provides heat necessary for plant growth, as well as stimulating cell repair/regeneration. In my research (though unrecorded), I ready it also allows for some "after dark" photosynthetic processes to continue for about an hour or so from when you turn off the lights. Not sure if the last part's been tested, but I know that I heard it from several sources, just none that I wrote down.

laserbrn said:

I have been a hater on LED's for a loooong time. I still don't think they are worth their weight.

I have a 4x4x7 grow tent that I currently run a 600w light in. I will purchase your LED panels if you will offer me a 90 full money back guarantee. If I am not impressed with the results and/or don't out yeild my 600w I want a refund. Does that sound fair? If you are that confident in the equipment, extend that confidence to me.

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Sounds fair enough to me, but I'd only allow that for you since you asked

scwascwa said:

got a question for this here LED forum..


i was going to try and build a new grow box (not to big ) and use LED christmas lights and line the whole box with a shit ton of them


question is... would the plant grow.. would it get to hot with a simple ventilation one fan in one out ???

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I think the box would get hot, and I don't think they have enough power to drive photosynthesis, or penetrate your leaves. Also, I have no idea what the spectral output of christmas lights are lol. Anyhow, only way to figure out if it works its to test it, but I don't foresee good results unfortunately.

poke smot420 said:

as far as i'm concerned LEDs arent shit to HID in super big grows. maybe in a couple years when the technology becomes better(and cheaper) then i'll give it another try.

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If LED's can already outperform HID in small grows, what makes them any less in a super big grow? You're still using the same light source, just more of them, with more plants... In my opinion, HID isn't shit compared to LED, but that's cause I've seen it in person.

bushmang said:

led girl how long did you veg your plants for? have you tried these lights on conventional sog style with 7 to 14 day veg times. how are the buds when the plants are still small?

the set up looks awesome im still not convinced about the yield but my thinking may be bias due to all the bad yields i have read about with led, your shit looks very bright and the buds looks nice im just wondering how long it took to get the plants to its size.

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I veg between 4-5 weeks. As far as I know, so does my friend. I tell her to put her plants into bloom at 18", like me. My room is definitely a SOG. It's almost completely filled right now, and has never looked so alive! Anyhow, I get big buds off of my small plants. Most of my plants never top 2.5'. One of my strains hits 3 upon occasion.

LEDGirl said:

I veg between 4-5 weeks. As far as I know, so does my friend. I tell her to put her plants into bloom at 18", like me. My room is definitely a SOG. It's almost completely filled right now, and has never looked so alive! Anyhow, I get big buds off of my small plants. Most of my plants never top 2.5'. One of my strains hits 3 upon occasion.

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I veg my plants for about 5 wks,,,or until they are around 3 and a half ft ..I have a large space 10x 12 ft,, and I like large plants..they will be around 6 ft+ when they are finished... From what I understand to get the effect of my 2 x 600 w HID ,,I would have to replace them with over 10 of your 125w LED lights with the 30 degree angle ... have I understood correctly???

jats said:

I veg my plants for about 5 wks,,,or until they are around 3 and a half ft ..I have a large space 10x 12 ft,, and I like large plants..they will be around 6 ft+ when they are finished... From what I understand to get the effect of my 2 x 600 w HID ,,I would have to replace them with over 10 of your 125w LED lights with the 30 degree angle ... have I understood correctly???

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My plants would likely be 3' after 5 weeks, but we top them 3x during the process, making them into compact 18" bushes. When finished, they stand about 2.5' tall, and my average yield with HID was 3-4 ounces per plant. My largest plants produced between 6-8 oz's. I'm expecting higher yields now with my lower wattage LED setup.

Out of curiosity, what does one of your 6' tall ladies yield, and how many of them do you fit into your 10' x 12' room? You said you're currently covering 10' x 12' with just 2, 600W lights? To me, that seems like a very large area, for only 1200W (10W per square foot). The reason I ask, is that I have several friends who grow 6' tall ladies, filling up a large area like yourself, without that much lighting. At best, they yield half of my average (2oz's), per plant, with plants that are twice the size. They also grow 3x more plants than me, to make up for the difference. So how you grow, has a lot to do with how many lights you need, and what you'll yield.

Anyhow, if you continued growing the same style you do now, where plants are 6' tall, and you fill up a 10' x 12' space, you're going to need a lot of 30 degree lights to cover it. 10, 126W units would provide far more yield than your current 1200W of HID, but it's your area that throws off how many units you need. I'm all about maximizing space, and yield, which is why I grow 22 shorter plants in a 5' x 6' canopy with my 60 degree lens. Using my method, I produce a lot per plant, with less total lights needed, as may area is fairly small. Because I use the 60 degree lens, I can get also get a larger coverage area out of each light.

my last harvest I got 2 and a half pounds dried. from 4 plants... I used half my space for that grow..I had 2 x 600 w and 1 x 400 w HID that time... it was the first time I grow in coco (which I think is awesome stuff.).. I have started using autopots for this grow and will be adding more as my clones come on line.. at the moment I have 3 plants that are twice as bushy as the last four I grew..I tip them too...,and they take up a bit less then half the space... I have a grow journal but will post a photo here so you get an idea of what I'm working with

the shot id taken from against the wall you can see the res on the other side of the room...
they are quite bushy plants

Those are some very nice looking plants! 2.5 lbs is a good yield from 4 of them, compared to any of my friends, so you do a much better job What confuses me is when people tell me their grow area (10' x 12"), as I just assume that they're using the whole space for growing. It's easier for me, to know just the canopy area, as that's all the space you'll need to supply light to anyhow.

So if you could tell me how many plants, and how large the total area they are occupying, I could make a lot better recommendation for your space

Anyhow, I'm heading out for my trip! I probably won't be able to respond to anything until late sometime tomorrow, and I'll likely take less time to do responses while on vacation. I'll try to stay in touch, and see you all later!

Thankz,,, I'll get the measuring tape out and get back to you on that... :^)

LED girl, what brand are you using? Personally, for my first I am using a 90w grow ufo, and for a closet grow w/ 6 plants, it's giving me quite impressive results. However, I just started the flowering cycle a few days ago--let's see what happens

odinfolk said:

LED girl, what brand are you using? Personally, for my first I am using a 90w grow ufo, and for a closet grow w/ 6 plants, it's giving me quite impressive results. However, I just started the flowering cycle a few days ago--let's see what happens

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The brand is Hydro-Grow-LED