IES LM-82-20

The performance (e.g., luminous flux, life) of light emitting diodes (LEDs) depends strongly on the temperature at the LED junction, and this temperature can vary depending on how the LED is integrated into the luminaire and on the application environment. LED light engines and integrated LED lamps are used in many different types of luminaires, including those for decorative lighting and non-directional applications. This document establishes consistent methods of measurement and data presentation for ease of interpretation and comparison, which will assist luminaire manufacturers in selecting suitable LED light engines and integrated LED lamps for each luminaire product. It defines the procedures to measure optical and electrical properties as a function of temperature of LED light engines and integrated LED lamps. This document is also applicable to LED luminaires.