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| General Indoor Growing Lighting, mediums, feeding, efficiency and more. |
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LinkBack (38) | Thread Tools | Display Modes |
03-14-2007, 05:50 AM
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Registered User
Join Date: Mar 2007
Posts: 1
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Do I need a
Hi guys! Glad to have found this!
I've just gotten my first Cree XR LEDS and am starting two semi-stealth closets. I'm sorry I haven't read the whole thread, but here's some info: The correct way to measure light for plants is in PAR, Photosynthetically Available Radiation. This is measured in Einsteins, 1 Einstein being equal to a mole of photons in the 400-680nm wavelength per square meter per second. A mole is a constant representing about 10^23 particles. According to my reading, plants in general are OK with 200 micromoles photons/s/m2 (this is also called a microEinstein, uE) on every leaf surface. This is not to say that 200 uE is enough on the plant itself, because of shading and light intensity falloff, but if all leafes get this amount of light, it should be OK. High intensity sun light get above 2000 uE, but no plant feels good about this much light; they have to devote energy to protection mechanisms just to avoid damage. I'm planning to set up my diodes so that each surface gets about 300 uE. Gotta go! |
    
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03-15-2007, 05:57 AM
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Moderator Extraordinaire
Join Date: May 2003
Location: Tornado Alley
Posts: 6,573
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Ransardd,
Definitely read this whole thread. We had the conversation about mcd's and PAR. I think it was on page 9, 10. fokaz, Thanks for the conversion. Our LED's are 3 watts each and 190 lumens. wwaylon99, I will get pictures of my cloner up tomorrow. If/when those suckers root I will get some back under the LED's and we will see. My friend has grown veggies and weed under the LED's from start to finish but, since he does not really smoke so, the jury is still out on how the THC developed. By the look of his plants, there is no reason why the THC should be no good.
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"I build cars for young men that only old men can afford"- Enzo Ferrari (1898-1988) LED Thread http://forum.grasscity.com/general-i...ghts-pics.html PGAMG Thread http://forum.grasscity.com/general-i...acle-grow.html MG vs. Generic Soil Thread http://forum.grasscity.com/general-i...icle-grow.html |
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03-15-2007, 07:34 AM
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Registered Grower
Join Date: Feb 2007
Location: Florida
Posts: 194
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I need to venture out of grow journals every once in awhile lol , keep us updated , i'm just catching on , but i've already caught up
 Led lights sure are looking good right about now
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"Load universe into cannon. Aim at brain. Fire." -Alan Watts http://forum.grasscity.com/grow-jour...perpetual.html Revegg to SoG(current) http://forum.grasscity.com/grow-jour...ml#post1467874 My Indoor Garden(Retired Thread) |
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03-15-2007, 07:45 AM
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Registered User
Join Date: Dec 2003
Posts: 424
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LED grow lights !!!
Whats up.. what kind of leds did you use to make that light? you shouldn't need a ballast for leds, they use next to nothing for power. i was reading the new high times magazine and they had an ad in there for led grow lights. check it out..... www.ecogrowbar.com i'm thinking of getting one for my 2nd grow area.. it's only 2x3x5.5 my main grow area is 4x4x7 and has a 400w hps/mh but i'd like to compare and see what gets better results. if leds work as well as the hps, i could setup 2 more grow areas and still use less power than i am now.
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03-15-2007, 11:39 AM
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Registered User
Join Date: Feb 2007
Posts: 419
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great thread! just read the whole thing, fascinating concept, on the issue of hermies, if the reason IS because of light penetration, would there be any way to make a sort of LED curtain, this could hang all around the plant and give it even light all around, might improve yield aswell, no idea how you would do this but just an idea!
best wishes on the surgery SmknVTEC, prayers go out to you and your family
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Bitches Blunts Liquor n Stunts my first grow: http://forum.grasscity.com/grow-jour...w-journal.html My 2nd Grow: http://forum.grasscity.com/grow-jour...ite-widow.html Im the Cosmic Gypsy, Tipsy from Plutonium Whisky |
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03-16-2007, 03:19 AM
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Registered User
Join Date: Dec 2003
Posts: 424
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i was thinking of something similar, making strings of led lights, like chistmas lights, but with leds and running them around and through the tire growing area, that way the whole plant would bud as much as the top colas.
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03-16-2007, 04:10 PM
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Registered User
Join Date: Mar 2007
Posts: 688
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Some time this year I would like to order some LEDs and buy a circuit board from radioshack then build my own lights but its a lot of hard work... too bad buying them premade is very expensive. : (
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03-16-2007, 07:37 PM
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Weedsman
Join Date: Oct 2006
Location: MassiveTwoShits (MA)
Posts: 337
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well, i guess us power misers will just have to stick with cfls for now until led systems get less expensive. but prices will drop. hell, remember how expensive cfls were when they first came out and now theyre mad cheap
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03-17-2007, 06:03 AM
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Moderator Extraordinaire
Join Date: May 2003
Location: Tornado Alley
Posts: 6,573
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"I build cars for young men that only old men can afford"- Enzo Ferrari (1898-1988) LED Thread http://forum.grasscity.com/general-i...ghts-pics.html PGAMG Thread http://forum.grasscity.com/general-i...acle-grow.html MG vs. Generic Soil Thread http://forum.grasscity.com/general-i...icle-grow.html |
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03-17-2007, 07:34 PM
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Registered User
Join Date: Mar 2007
Posts: 2
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SmknVTEC were you saying the LEDs balla420 was suggesting were not as good as HPS or that the ones you were using weren't (little confused). Also if it's just the ones he was suggesting where do you suggest for LEDs? I'm not afraid of a little DIY and handiwork either so if theres a place to just get the best individual LEDs that sounds good too. You said the ones you were using were something your friend made or something? I'm a little unclear on that. (I skimmed through the thread to catch up but I'm still a little unclear so any help would be great).
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03-17-2007, 07:58 PM
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Moderator Extraordinaire
Join Date: May 2003
Location: Tornado Alley
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Our lights when used with nothing else do grow the weed. My buddy designed that hood, power source and everything else you see pictured on page 1 and 2. He has a patent pending on that very light. You can see at least in veg my plants almost looked normal except for the stretch. However, because of that stretch and slightly slower rate of growth, I still think at this point, even our LED’s will not be as good as an MH light. Here is where we got ours LED’s: http://www.luxeon.com/ http://www.luxeon.com/products/family.cfm?familyId=7
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"I build cars for young men that only old men can afford"- Enzo Ferrari (1898-1988) LED Thread http://forum.grasscity.com/general-i...ghts-pics.html PGAMG Thread http://forum.grasscity.com/general-i...acle-grow.html MG vs. Generic Soil Thread http://forum.grasscity.com/general-i...icle-grow.html |
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03-17-2007, 08:23 PM
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Registered User
Join Date: Mar 2007
Posts: 2
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O.k.
That helps clear things up a bit. Your plants looked great in veg so if nothing else I may order some just so that I can reduce my power use for the plants that are in veg. I saw those hoods you made they were pretty nicely put together. How many LEDs would you recommend per plant (roughly)? I'm looking to get setup (buy the stuff and have most of it assembled) before this fall because I'm moving and I'll be growing indoors. I have a few outdoor grows under my belt but the indoors is pretty new to me so I've been doing my homework. Also just want to say thanks for all the awesome posts in this thread! (to everyone but esp you VTEC) 
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