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Re: Any experienced Metal Halide Users

  • Subject: Re: Any experienced Metal Halide Users
  • From: "Dan & Lu Nelson" <Hostanut@Bellsouth.net>
  • Date: Thu, 12 Aug 2004 09:01:47 -0400

      www.hydroponicsonline.com  LESSON ONE

     Introduction to Hydroponics 1-8


Lighting Your Garden


There are four basic building blocks on which plant life is based: Light,
Water , Nutrition, and Climate.
The most common factor that limits plant growth is the light source. Gardening
outdoors, this obviously is not a problem; Mother Nature has seen to proper
light balance and intensity for healthy plant growth. The responsibility for
proper indoor lighting falls on the gardener. If your plants are not furnished
enough light of the correct spectrum, they often will be mere shadows of what
they could have been, if they grow at all. When you can't rely on Mother
Nature to handle the lighting for you, the next best thing is a High-Intensity
Discharge (HID) Metal Halide light system.

It is hard to compare HID lights with fluorescent tubes or incandescent light
bulbs. Although they each create light from electricity, that's where the
similarity ends. Fluorescent tubes emit a gentle, low temperature light in a
very low wattage. Excellent for the first two weeks of most any plant's life,
fluorescent lights simply do not provide the intensity of light required for
most vegetables, flowers and ornamentals. Incandescent lights ('regular' light
bulbs) are even worse for horticulture because they are very expensive to
operate, put off as much heat as light, and do not offer the spectrums of
light required for healthy plant growth. Even when incandescent light bulbs
are altered with interior coatings to change their spectrum (like the "grow
light" bulbs you see in the grocery store), they still do not come close to
providing the kind of light a plant needs for robust, active growth. The only
thing that will really grow and prosper under an incandescent grow bulb is
your electric bill!

HID lighting systems represent the safest, most economical way of providing
light for your plants. They are used all the time in parking lots, warehouses,
baseball diamonds, football fields and other places where reliability and
economy are a prime concern. Systems used for garden lighting are constructed
differently, but the features of
dependability and cheap operation remain the same.  Two common types of HID
lighting have been adapted for safe use in the garden and greenhouse,  Metal
Halide and High-Pressure Sodium.

Metal Halide light produces an intense light of a blue-white spectrum
excellent for vegetative plant growth. Geraniums, marigolds, mums, zinnias,
and violets all thrive under Metal Halide light, as do most vegetables. A
plant grown under a halide light will often exhibit increased leaf growth, and
strong stem and branch development. Roses grow hearty  under metal halides,
and seem to burst with buds before flowering time. A wonderful general purpose
garden light, if your garden is to have only one light source, metal halide
will be your best choice.

 High-Pressure Sodium. (HPS) light puts off an orange: shaded light which
simulates the rich red hue of the autumn sun. Best as fruiting or flowering.
lights, the HPS systems are often used In conjunction  with metal halide for a
complete balance of light spectrum in the garden. Flowers and vegetables
finished off under HPS will show tighter, stouter blossoms with increased
yields. HPS lights are commonly used in commercial greenhouses as
starting lights and for supplemental light for  off-season crops. Some types
of plants respond particularly well to HPS lighting, such as the herbs dill
and coriander.

      Average Lumen Per Watt Output of Common Lamps

100 Watt Light Bulb -                       17.5 Lumens per watt

40 Watt Fluorescent Tube -                22 lumens per watt

1000 Watt Metal Halide -                   125 lumens per watt.

1000 Watt High Pressure Sodium -    140 lumens per watt


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