LED Lights



North American Sales

11320 Neeshaw Drive
Houston, Texas 77065

Main: 281.807.3320
Fax: 281.807.0886


Internet Retail Sales

Website: www.amperordirect.com

Sales: 281.664.1209
Fax: 281.807.0886


Ask Howard


Howard is our FA Engineer based in Houston, TX. Read his articles below or discuss your power supply design requirements with him.

Closed-Loop Tunable White Solution

Amperor LED Driver Selection Guide

How to Make the Most out of Your Class 2 LED Driver

US Sign Builders - Stop Thinking about IP66, Start Thinking about UL879

Constant Voltage or Constant Current LED Driver?

EMAIL Howard

Amperor LED Driver Selection Guide

Pick the LED Power Supply You Need


Below are some questions to help you select the ideal power supply for your LED applications. You can also read the short-version selection guides in PDF format HERE.


  • Which topology should be used - Constant Voltage or Constant Current?
  • Component level LEDs are better driven by a constant current source because it better controls the brightness and avoids lifespan decreasing of the LEDs in use. However there are semi-assembled LED modules, which contain several LEDs and an on-board constant current source, available on the market. This makes it possible to use the constant voltage driver in the LED application.

    If you have selected the LED module to be used in your application, follow the instructions provided by module manufacturer to pick the appropriate LED driver. If not, it is important to remember that the constant current source can be either implemented on the LED module level or realized by using the constant current LED driver. You must first select an LED module in order to determine whether you need to use a constant voltage or a constant current driver.

    Please click on the link to read the detailed instructions on deciding between the constant voltage and the constant current driver.


  • How to read the Amperor LED driver model number:
  • Amperor’s LED driver model number is typically formatted as “ANPXX-YY.” The “XX” represents the total output power of the unit, and the “YY” indicates the output voltage level. For example, ANP90-24PY is a 90W, 24V output LED driver. Other letters are typically used in the model name to indicate other implemented features. Please refer to the below selection guides for details:

    Please note that engineering samples products currently in development are available for review.


  • Review the desired LED module connections / combinations to determine the required voltage and current / power output on the LED driver.
  • As an LED lighting or sign engineer, you know the required number of LEDs to be installed and the location at which to employ them, in order to create the desired optical effect. As a professional LED driver provider, we can help you decide how these LEDs can be connected to the driver in order to ensure an evenly brightness output across the system and an acceptable reaction to the fault condition. Below are some simple rules to consider:

    • You don’t want to put all the LEDs in one big series connection. If one LED goes out, the whole string stops to function correctly.

    • LEDs are usually installed in a combination of series and parallel connections.

    • The number of the LEDs placed in the series connection in one LED string is used to calculate the voltage needed to be applied across the string. The pre-assembled LED modules / strings on the market usually require 12V or 24V LED drivers. Some companies that assemble their own LED modules in-house are using the higher voltage output options, such as the 36V or the 48V, so that they can mount as many LEDs as they can to one string as possible.

    • The number of the LED strings placed in the parallel connection is used to calculate the required power level for the whole setup. If the Class 2: 100W output limit has been meet, you can either purchase more single channel (ANP90) or use the dual channel (ANP155) / quad channel (ANP240) LED driver for the higher power output level.


  • What are the environmental factors? Below are some questions to consider:

    • What are the voltages available at the application location? Does the LED driver need to support a commercial building’s 277Vac voltage?
    • Do you need a true waterproof LED driver to power your outdoor LED application?
    • What is the required operation temperature of the LED application?
    • What is the temperature de-rating curve of the driver?
    • What is the system cooling mechanism? Does the LED driver need to be convectionally cooled?


  • How does the LED driver connect to the system?
  • All of Amperor’s LED drivers provide stripped input and output cables for easy connection. You can use either wire terminals or wire nuts to make the connection.


  • Do you require a dimming function?
  • Amperor offers a separate dimming module (DIM-240) to work with its LED drivers. Some models currently in development, such as the ANP60 and ANP72, have the dimming function built-in on the power supply.


  • What are the required certifications?
  • In the United States, there are two major UL certifications for the LED drivers: UL879 for the signage industry and UL8750 for the lighting industry. Read here to learn more about the UL879 certification.


  • Cannot find what you need? You can consider a custom design.


Please contact us by phone (281-807-3320) or by EMAIL. We have product evaluation samples in stock and ready to ship from our Houston office.




(c) Amperor, Inc. 2008