June/July 2014
Volume 9,  Issue 4
LED Gardener  

In This Issue
The More You Know Part 3
Introducing the New LGM Chameleon

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The More You Know Part 3
     Your growing medium, the growing environment’s ambient
temperature, and the radiant heat emissions from your light
source will all affect how much and how often you water.  Most
growing mediums have been designed for, and often advertise
water retention; simply because most growing mediums are
designed around a radiant (hot) light source.  This heat causes
excess amounts of water lost to evaporation making water
retention a sought after quality in a medium. LED gardeners,
in particular those using 5mm HB LED plant lights have virtually
no heat emitted from their plant lighting.  

     Without a heat source, gardeners growing under only LED
lighting have very different requirements for their medium.  A
medium designed around an LED light source should dry out
quickly.  An LED medium features porosity and the ability to hold
oxygen. If the medium is always saturated, the roots are not able
to take up oxygen.  Freshwater Diatomaceous earth is an
excellent medium for LEDs.  If you already have a mix you like,
simply adding in some gravel or perlite to your existing medium
can be helpful.

     The reaction heard most often when I tell people about the
extremely low heat emissions of the LEDs is one of joy.  It seems
almost everyone has had problems with overheating or leaf burn caused by their lighting system.  It’s at this
moment I’m morally obligated to burst their bubble.  The growth rate of many plants is controlled to a large degree
by temperature.  Temperature can be used in combination with day length to affect the duration or initiation of
blooms in many flowering plants. Temperatures alone can also influence flowering.  Heat requirements are closely
related to lighting choices and directly affect your water requirements. Heating needs are going to vary by time of
year and stages of the indoor plants but most gardeners will need to add heat to their environment if all traditional
lighting has been eliminated.

     To control the rate of development  in your plant growth environment, special care must be taken to ensure
proper temperature levels including the ambient temperature of your growing environment,  the intra-canopy
temperature, and your plant's root zone temperature.  

Ambient temperature is the temperature of  the air surrounding your plants;  ambient temperature should
range from 65º-80º F or 18º-27º C for most full sun plants .  

Intra-canopy temperature is the temperature of the air within your plant canopy where the plants swap
oxygen for CO².  Temperatures are normally 5º-10º F (-15º to -12º C) higher than ambient air temperature.

Root zone temperature is the temperature of your "soil" or nutrient solution usually ranging from 65º-72º F
          or 18º-22º C.  

     Infrared, is the heat you feel on your face while working under a HPS lamp.  Infrared is responsible for heating the plants while raising the intra-canopy temperature. Maintaining an optimal ambient temperature by using a
"heater" will not have the same affect on your garden as using traditional heating methods such as high pressure
sodium lamps or sunshine. Heating ambient air using a heater is fine while plants are growing vegetation, but
Science tells us IR (radiant heat) is needed for proper flowering.¹  

     Traditionally, indoor growers' are forced to manage excessive heat loads, by exchanging the air and/or cooling
the environment, just to keep temperatures down close to optimal.  Using the Original LGM Hybrid Method,
growers enjoy the ability to "add" heat until environmental temperatures are optimized, This hybrid method will give
you complete control over your grow. Check back in August for part 4 to take a look into the next aspect of the
growing environment we want to control, the chemical elements. --AL

¹ http://aggie-horticulture.tamu.edu/archives/parsons/publications/houseplant/houseplant.html
5mm HB LED plant lights
5mm HBLEDs Put Off Virtually No Heat
Introducing the New LGM Chameleon
           This multi-color LED flashlight is as unique and adaptable as the animal it’s named for.
    The Chameleon’s ergonomic design is both anti-roll and anti-slip. Using a trio of Cree's XP-E
    LEDs you can form a range of color combinations not found in any other flashlight. Mix and
    match 625nm red, 530nm green, and 460nm blue or turn to 380nm UV mode. Garden specific
    applications include a UV setting for detecting insects or mold in your growing environment, and
    a green setting for night time vision or viewing of the garden without interruption of your

                                      Not-so-garden specific, but cool uses for the Chameleon, include counterfeit bill detection
                           using the UV setting. The red setting is preferred by some over the green for night vision as it
                           increases the contrast (but would interrupt your photoperiod.)  Maybe you would need the red
setting in a covert operation you happen to be involved in that would make you want your light to be difficult to see
from a distance...? Blue is a good reading light and the only color of light that cuts through the fog. Applications
are endless and the flashlight includes a no hassle Lifetime Warranty.
Click here for introductory pricing good only through July 31st.
Multi color LED Flashlight
LGM Chameleon
Making Room For
A Minnesota man didn't know he
had Superman power until he
bent the door of a burning SUV
with his bare hands to rescue
another motorist.
Read the full story of Bob's
miraculous good deed here.
LED Light Lettuce