Certifications/Compliance
Standards and certifications comprise a vast number of companies and compliances that serve specific purposes—primarily addressing safety, environmental impact, energy efficiency, and sanitation. They are divided into categories for each product type and certification type to allow for very specific qualifications related to each product. When this system is being used as intended, it gives consumers, installers, suppliers, and anyone else who may be involved confidence that the product is safe and will work well in their application. UL and ETL certifications relate to safety and installation and are the most common for power supplies.
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Dimming Control
TRIAC Dimming: This is the most commonly recognized dimming type, with TRIAC Dimmers found in most Home Centers and hardware stores. TRIAC (TRIode for Alternating Current) dimmers operate by modifying the voltage waveform, reducing the amount of power input to the device being controlled. Reducing the input power will result in a corresponding reduction in a power supply's output voltage/current or a decrease in the lumen output of a light fixture. TRIAC dimmers come in two variations: Forward Phase and Reverse Phase
MLV (Magnetic Low Voltage): Also known as Leading Edge or Forward Phase Dimming, this type of dimming controls the amount of power delivered to the load by chopping off the leading edge of the AC waveform, reducing the power supplied and thus dimming the output.
ELV (Electronic Low Voltage): Also known as Trailing Edge or Reverse Phase Dimming, this type of dimming controls the amount of power delivered to the load by chopping off the trailing edge of the AC waveform. These dimmers can result in smoother dimming performance, reduced flicker, and reduced hum, especially with electronic low voltage (ELV) lighting.
0-10V Dimming: This type of dimming control is most commonly found in commercial applications. It works by varying a voltage from 0 to 10 VDC on dedicated dimming wires. The output of a power supply or light fixture is proportional to the voltage applied.
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Pulse-Width Modulation (PWM) Dimming: This dimming control adjusts output by rapidly turning the output on and off at a fixed frequency. The proportion of on-time to total time sets the dimming percentage.
Potentiometer Dimming: Potentiometer dimming varies the output using a variable resistor, or potentiometer, to set the dimming level.
Certifications/Compliance
Standards and certifications comprise a vast number of companies and compliances that serve specific purposes—primarily addressing safety, environmental impact, energy efficiency, and sanitation. They are divided into categories for each product type and certification type to allow for very specific qualifications related to each product. When this system is being used as intended, it gives consumers, installers, suppliers, and anyone else who may be involved confidence that the product is safe and will work well in their application. UL and ETL certifications relate to safety and installation and are the most common for power supplies.
Output Power
A power supply's power consumption is measured in watts and refers to the maximum amount of power it is capable of delivering. For best results, choose a power supply that offers a minimum of 20% wattage overhead for your application. Wattage overhead ensures that your project will function correctly, extends the life of the power supply, and offers greater design flexibility by allowing for project expansion.
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