IES LM-51-20 PDF Download

The IES LM-51-20 standard outlines the procedures and precautions necessary to obtain consistent and reliable measurements of the electrical and photometric properties of high intensity discharge (HID) lamps. The standard specifically applies to HID lamps used in AC circuits at a frequency of 60 Hz.

The types of HID lamps covered by this standard include mercury vapor, metal halide, and high pressure sodium lamps commonly used in general lighting applications. The photometric measurements typically required include the total luminous flux (measured in lumens), luminous intensity (measured in candelas), and color properties of the lamps. These measurements provide important information about the lamp's brightness and color characteristics.

In addition to photometric measurements, the standard also specifies the electrical characteristics to be measured, including line voltage, lamp voltage, lamp current, and lamp power. These measurements help ensure that the lamps are operating within their designed electrical parameters.