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LEDs

topic posted Tue, September 22, 2009 - 2:05 PM by  Paul
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Apparently Lettuce loves Red LEDs It's way better than florescent light and the red is the single color that kicks the chlorophyll process in to gear.
www.metaefficient.com/hydropo...uce.html

But Blue is important for flowering.

The issue with LEDs is the learning curve. Ya gotta learn what power supplies work for how many LEDs. How to calculate forward voltages.

But with a little learning or the right hardware you can solder up a set of boards of LEDS of whatever size you want assembling them in parallel with a little resister on each one that attenuated the voltage to the LED it's driving: 2 volts for red and 4 for Blue.

I haven't got my head around the power supply issue .





posted by:
Paul
Georgia
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    offline 137

    Re: LEDs

    Tue, September 22, 2009 - 4:37 PM
    i've never grown with them but i've yet to see results that equal a sodium light - i'd like to, dammit. Love to grow big ass buds with so little juice and so little heat. They do seem to function just fine for grow phase, I've seen, but not so sure for budding?
    • D
      D
      offline 137

      Re: LEDs

      Thu, September 24, 2009 - 4:11 PM
      now that i'm not wandering across the face of New Mexico, I'll be looking into this in depth and post something

      still want to see some serious big ass buds from these LEDs - it seems that the science of LED grow lights is really taking off though so I have a feeling this will be the future. I'm pretty sure I'll be using them for the grow phase anyway, just not sure about budding. I don't want to experiment with a quarter million dollar crop when I know for sure that sodium lights kick ass!
      • Unsu...
         

        Re: LEDs

        Tue, October 6, 2009 - 6:53 AM
        how about CFLs?do they help a grow phaze~budding+
        • D
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          offline 137

          Re: LEDs

          Tue, October 6, 2009 - 7:20 AM
          very good for grow phase emit a very blue light good for clones or growing
          i've used huge CFL's for years and they now have a big 250w red shifted light that is fantastic for flowering - but, a sodium light will double the yield from a fluoro, I've found.

          LED light and healing -www.ncbi.nlm.nih.gov/pubmed/11776448

          so far as LEDs go, I looked hard at putting in my commercial grow room but i don't see the evidence for them even coming close to the production of a sodium light,. especially a good sodium light with an digital ballast. Also, when you read about these LED it is info from the sellers not objective fact - frankly, they lie. They pick up on each others lies and perpetuate them. They do not last forever as is often said. Few independent studies have been done and no serious growers I know are budding plants with them

          no thanks on the LEDs
  • Re: LEDs

    Thu, October 8, 2009 - 12:13 PM
    I've been learning about White LEDs in the 3 watt range. They are capable of emitting the full spectrum.
    Before this I was looking at red and blue LEDS as a primary light source balanced with reptile lamps.
    The high power LEDS are looking more and more like the way to go.

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