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That Guy
Registered: 08/12/08
Posts: 4,057
Loc: Southwestern US 
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 Re: LED lights  [Re: 114425]
#258994 - 08/02/09 09:43 PM (15 years, 7 months ago) |
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I am finishing up my first grow in an 80x80cm growtent using a 90W LED light from growlLED in a 7:1:1 ratio of red:blue:red-orange lights...amazingly tight internode length during vegging...and an overall decent looking plant from bagseed...
http://www.growery.org/forums/showflat.php/Number/238422
I only vegged 5 weeks to keep it short, I think it was about 6-8 inches tall with like 10 nodes or something like that...all info is on the log.
hope this helps, feel free to ask questions
agmotes165
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“The Universe is under no obligation to make sense to you” -NDT
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That Guy
Registered: 08/12/08
Posts: 4,057
Loc: Southwestern US
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Re: LED lights [Re: Agent 47]
#288535 - 09/29/09 06:31 PM (15 years, 6 months ago) |
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Chlorophyll a has 2 peak absorbing wavelengths, 430 nm (blue range) and 662 nm (red range) LEDs can be "tuned" to these frequencies or damn close through the manufacturing process...ensuring that nearly all of the light coming from LEDs is absorbed by the plant for photosynthesis.
Also, a "color" as you put it is a specific wavelength of light, a "spectrum" is a range of wavelengths of light including wavelengths that are nearly useless photosynthetically speaking.
A fluorescent light operates by passing a high voltage current through a low pressure gas (usually mercury) giving off primarily UV light...which is absorbed by a phosphor coating on the inside of the glass tube...which then emits a "spectrum" of light. HID lights operate by striking an electrical arc between two tungsten electrodes in a glass tube filled with various gases and mineral salts...the electrical arc heats up the gases and salts inside the tube...forming plasma and giving off visible light and large amounts of UV, usually requiring the lamp to have a UV filtering material around the tube to reduce risk of injury to living things. None of the gases or metal salts "burn". Its all about electron excitement.
The internet is your friend...sometimes research and logical thinking will outperform "the way its always been done"
peace friends...hope this helps a little
agmotes165
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“The Universe is under no obligation to make sense to you” -NDT
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That Guy
Registered: 08/12/08
Posts: 4,057
Loc: Southwestern US
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No problem 
feel free to ask for specific info...I'll try to get an answer as soon as I can haha.
peace guys,
agmotes165
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“The Universe is under no obligation to make sense to you” -NDT
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Data
That Guy
Registered: 08/12/08
Posts: 4,057
Loc: Southwestern US
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Re: LED lights [Re: mackabee]
#289888 - 10/01/09 04:24 PM (15 years, 5 months ago) |
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the thing is that I know for a fact that LEDs work...bc I have 1 complete grow under my belt and I'm the the flowering phase of my next grow.
and the reason you dont see them in huge grows is the price of the equipment is not on par with HID lighting, that and a lot of people tend to listen to other people's opinion on the matter rather than testing it out and see how they actually perform instead of how someone told you they perform.
peace friends,
agmotes165
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“The Universe is under no obligation to make sense to you” -NDT
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Data
That Guy
Registered: 08/12/08
Posts: 4,057
Loc: Southwestern US
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well I did a butt load of research, looking at all LED suppliers, and the ones from china you can get pretty cheap off of ebay, its just they leave out a lot of information and would cost you loads of time and money in shipping and handling if it breaks. I finally settled on growlLED (google it if ur interested) They have a pretty good return policy, can be contacted easily, and list things like lumen output.
The part I had the hardest time figuring out is the % of HID light that is in the red/blue spectrum so I could convert the lumen output for the LEDs to an equivilent output in HID or sunlight. I have found that for a 1:8 blue:red or a 1:1:7 blue:orange:red LED, you multiply the rated lumen output by 10 to get an extremely conservative estimate of equivilent light for an HID. Usually the ones I get are worth about 15x the lumen output, but LED light output diminishes over time...so we'll see how that works out.
For example, on the website, my 120W LED is rated at 4200 lumens, and they never look like they are putting out enough light, but at 3 inches above the canopy, it performs about like a 600W HID, or anywhere from 45-55k lumens of regular light.
The only drawback is lack of UVB, which can be easily fixed with a small reptile UVB CFL from petsmart. Also a 23W CFL during veg seems to help a lot, though I have gotten 1/8 inch internodal spacing from LED alone. The big thing is that you can put it right on top of the plant without burning, as long as the leaves dont actually touch the glass then they wont burn, period. 
hope this helps, if you have any more questions, I will try my best to give a good answer.
peace,
agmotes165
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“The Universe is under no obligation to make sense to you” -NDT
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