LM-79 is a standard that defines how the performance of an LED lamp or fixture should be measured A test according to LM-79 is carried out at a point in time and at a single temperature. Therefore, it gives no indication as to how the performance of the device under test (DUT) might change over time or how it might be affected by different ambient temperatures. 

The full name of the latest version of this standard is "IES LM-79-19 Approved Method: Optical and Electrical Measurements of Solid State Lighting Products". 

Electrical Measurement's: 

The electrical data that should be recorded in any LM-79 compliant test will include: 

• RMS AC voltage 
• RMS AC current 
• AC active power 
• Power factor 
• Total harmonic current distortion 
• Voltage frequency