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What Every Indoor Gardener Should Know About Metal Halide Grow Lights

Metal halide grow lights create fantastic light under which your plants will thrive. These grow lights are a HID, or high-intensity discharge, light. They are small grow lamps that produce a lot of light, and yet are more efficient to run than either incandescent or fluorescent light bulbs. Indoor gardeners and hydroponics enthusiasts get great results with their plants when they use metal halide lights.

Metal halide lamps are made up of several different parts. There are tungsten electrodes which are connected to a quartz arc tube, where the light is produced. Inside the arc tube is where you will find mercury vapor, different metals and noble gas, all of which play a part in creating the light produced by MH grow lights. The arc tube is covered by a glass bulb. There is a metal base, and a connection to the power source. Some metal halide grow lights use an arc tube made of alumina or aluminum oxide, as well. This type of grow light requires the use of a ballast to control the flow of the current through the arc tube in order for the grow lamp to function properly.

Each different type of grow light has a particular color-rendering index and correlated color temperature. This is true of the metal halide grow lights. Some of these lamps have an 80 color-rendering index, on a scale of zero to 100. This index ranks lights to show how well or poorly they reproduce colors of objects being lit by the lamp.

100 is the best rating, and zero the worst. Therefore, an 80 is reflective of a very good quality white light. In terms of correlated color temperature, MH grow lights can range from 3,000 K to 20,000 K. 3,000 is in the yellow range of the spectrum, while 20,000 is in the blue range. (K refers to the Kelvin temperature scale.) In terms of comparison, daylight registers in at 6,500 K, whereas a television screen is at 9,300 K and moonlight is at 4,100 K. If you are an indoor gardener, you are trying to recreate daylight in order for your plants to thrive, so you will want a bulb as close to daylight's 6,500 K as possible.

Light produced by a grow lamp can fall at different spots on the electromagnetic spectrum. Some lights lean more toward the blue end of spectrum, while others land on the orange and red end. This matters to the indoor gardener, because baby plants need light in the blue spectrum in order to grow well. If you want a mature plant to produce fruit or flowers, then you will need lights in the red and orange spectrum.

About the Author

Susan Slobac has enjoyed hydroponics gardening for years now, and has experimented with numerous types of grow lamps. She's had great success using metal halide grow lights for her indoor gardening at home and as part of her local gardening club.

Is it possible to have a magnet touch anywhere on a metal panel so that it would turn a light on?

I know this is a perhaps a wierd question, but I've got an idea for an invention that depends on this working.

Reed switches are likely to be what you're looking for. These switches are either normally open (type "A") or type "C" (common plus one normally open and other normally closed) which close (or change over) when near to a strong enough magnetic field. Forget about the metal plate. There's no need for it, and can prove to be a drawback, instead.

Most of them sell for under $2. They're compact, very reliable, and fairly sensitive, too. Just be careful not to exceed rated current hadling capacity. Some models can carry up to 1 A, but most should be operated with currents under 1/3 A. Among other applications, proximity sensors are built around them. It's an item most electronic dealers usually carry. If you can't locate them near you, try www.newark.com., or Jameco Electronics, www.jameco.com.

Good luck.

Billy Crudup to Star in Adam Rapp's Metal Children World Premiere Off-Broadway
Stage and screen star Billy Crudup will star in the world premiere of Adam Rapp's The Metal Children which will play Off-Broadway at the Vineyard Theatre this spring.

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