In This Issue
LEDs Down Under


Plants, Light, and LEDs
Part 4

















Featured Distributor
Light Earth Design Pty LTD
Melbourne, Australia
www.lightearthdesign.com


Featured Product:
The LGM3
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Encourages robust,
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  LED Gardener


    LEDs Down Under
           Energy efficiency, sustainable agriculture, and water conservation are
    all issues that have become priorities worldwide.  Few continents are feeling
    the pressure on the same level as Australians.   Statistics claim that energy
    consumption per capita has surpassed three times the world average.  Only
    six percent of the land is fit for cultivation and much of this will be lost to
    dryland salinity as the water shortages continue.  As they say in Australia...  
    "Things are crook in Muswellbrooke."
           We are always pleased to have an opportunity to work with a company
    that is devoted to making a difference in their community.   Light Earth
    Design Pty LTD, is just such a company with plans to introduce the latest in
    efficient agriculture- led grow lights.   Light Earth Design is a family owned
    company based in Melbourne and answering the demand for an Australian
    distributor of LED Grow Master lighting.  
           What can one company do in the face of these challenges?  The same
    thing LED Grow Master is working towards here in the USA.   LED grow lights
    can reduce energy consumption, conserve water, and increase food
    production in a way that does not increase the degradation of limited arable
    land.   If you would like to be part of a solution-  contact Light Earth Design
    Pty LTD at  admin@lightearthdesign.com to find out how.--AL   
                           
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Plants, Light, and LEDs   Part 4
           How many different colors of light do plants need?  That's a good
    question, and one for which nobody has a complete answer.  We can
    identify the pigments contained in plant tissues, and we can figure out the
    absorption curve for each of those pigments.  After that though, things start
    to get a little vague, and there are many opinions about what colors of light
    plants require, but not many definitive answers.
           The primary pigment-driven process in plants and the one that's been
    studied the most and is best understood, is photosynthesis.  There are
    several types of chlorophyll in plants, and they all have absorption peeks in
    the red and blue portions of the light spectrum.  Because of this, many early
    studies of how different light affects plant growth focused on the use of red
    and blue light.  Many people point to early NASA studies involving the use of
    red and blue light for plant growing as proof that those are the only light
    colors needed to grow beautiful, healthy plants.
           Unfortunately the NASA studies didn't really use only red and blue light
    sources.  They used red LEDs, which were readily available at the time, plus
    a small amount of fluorescent lighting to provide the blue component.  Why?  
    Because blue LEDs hadn't yet been invented.  The true result of the early
    NASA experiments was that using red LEDs along with fluorescent lighting,
    which contains many colors of light, provided reasonable plant growth, but
    not that plants will grow well using only red and blue light.  
           In our own experience we have found that while plants will indeed grow
    using nothing more than red and blue light sources, they don't turn out the
    same as plants grown in full sun.  Their coloring may be different, or their
    flowers may not have any perfume.  In fact, they may not bloom at all.  
    Vegetables and herbs may have either a strange taste or not have any flavor
    at all.  
           The fact is that plants contain a broad array of pigments, and not all
    plants contain the same pigments, yet they are all there for a purpose.  In
    many cases we don't yet understand what the purpose of one or more
    pigments is, but they all have some purpose.  A man-made light generator
    that provides all of the colors readily absorbed by the pigments will likely
    perform better than grow lights containing very few light colors
    .--CEO SolarOasis
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             Copyright 2008   ALL RIGHTS RESERVED  LED Grow Master Global, LLC
July 1, 2008             Volume 3,  Issue 7