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Low Voltage Lighting: 15 Things You Need to Know
Home Home Home Improvement
By: Tom Farin Email Article
Word Count: 930 Digg it | Del.icio.us it | Google it | StumbleUpon it

  

The use of low voltage lighting systems has become increasingly popular over the past several years. Low voltage halogen and low voltage xenon lighting systems can be found in almost any setting – restaurants, hotels, bars, retail stores, museums, art galleries, offices, and the home. We have all seen these types of lighting systems in the form of cabinet lighting, cove lighting, landscape lighting, picture lights, regular track lighting, flexible track lighting (sometimes referred to as monorail lighting), cable lighting, and under cabinet lighting. Here are 15 things that you should know about these low voltage lighting systems.

1) Low Voltage A low voltage lighting system usually operates on 12 or 24 volts.

2) Transformer A transformer is generally used with low voltage lighting systems to “transform” the standard voltage that is normally available (usually 120 volts or 277 volts) to either 12 volts or 24 volts.

3) Type of Transformer The transformer used in a low voltage lighting system may be either electronic or magnetic.

4) Maximum Transformer Wattage The wattage rating of the transformer should always be equal to or greater than the total wattage of the lighting system. If an electronic transformer is used, then the maximum wattage of the lighting system may be equal to but not greater than the wattage rating of the electronic transformer. If a toroidal magnetic transformer is used, then the maximum wattage of the lighting system may be equal to but not greater than the wattage rating of the toroidal magnetic transformer. If, however, a conventional EI magnetic transformer is used, then the maximum wattage of the lighting system may be equal to but not greater than 80% of the wattage rating of the conventional EI magnetic transformer.

5) Minimum Transformer Wattage Transformers usually have a minimum wattage that they must power before they work. For example, it is not uncommon for 60-watt electronic transformer to require that there be at least 10 watts of lighting load and if there is only 5 watts of lighting load connected to this 60W electronic transformer, the lighting system will not work.

6) Electronic Transformers An electronic transformer is generally lighter in weight, smaller in size, cooler to operate, and quieter than a magnetic transformer. However, electronic transformers cannot provide more than 300 watts of power whereas some magnetic transformers can provide as much as 1200 watts of power.

7) Voltmeter Readings Because an electronic transformer provides its power at very high frequencies (usually greater than 20,000 Hertz) a standard voltmeter cannot be used to accurately measure the output voltage. Instead, a “true RMS” voltmeter must be used to measure the secondary voltage of an electronic transformer.

8) AC Electronic Transformer An AC (alternating current) electronic transformer should not be placed any farther than 10 feet from the lighting system. If it should be placed farther away than 10 feet from the lighting system, part or all of the lighting system will experience a lower voltage (known as voltage drop) and have dimmer lamps. Also, the longer the distance from the AC electronic transformer and the lighting system, the greater the chance that it might create radio frequency interference (RFI) with other electronic components in the area.

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Tom Farin is the founder and President of Pegasus Associates Lighting. Dr. Farin has been in the field of lighting for 20 years. He has extensive training and experience in lighting, physics, mathematics and education, acquired at the undergraduate level, in graduate school, and in the field. www.PegasusAssociates.com

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